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Name Vendor Architecture Repository Boards Manager URL Repository Data Folder Branch Name Notes
Adafruit AVR Boards adafruit avr https://github.com/adafruit/Adafruit_Arduino_Boards https://adafruit.github.io/arduino-board-index/package_adafruit_index.json / master
Adafruit nRF52 adafruit nrf52 https://github.com/adafruit/Adafruit_nRF52_Arduino https://adafruit.github.io/arduino-board-index/package_adafruit_index.json / master
Adafruit SAMD Boards adafruit samd https://github.com/adafruit/ArduinoCore-samd https://adafruit.github.io/arduino-board-index/package_adafruit_index.json / master
Adafruit TeeOnArdu TeeOnArdu avr https://github.com/adafruit/TeeOnArdu https://adafruit.github.io/arduino-board-index/package_adafruit_index.json / master
Adafruit WICED adafruit wiced https://github.com/adafruit/Adafruit_WICED_Arduino https://adafruit.github.io/arduino-board-index/package_adafruit_index.json / master
Adelino AVR Boards adelino avr https://github.com/neoautus/Adelino http://cdn.adelino.cc/downloads/package_adelino_index.json /Platforms/Arduino/AVR/ master
Adelino ESP Boards adelino esp8266 https://github.com/neoautus/Adelino http://cdn.adelino.cc/downloads/package_adelino_index.json /Platforms/Arduino/ESP/ master
Akafugu Boards akafugu avr https://github.com/akafugu/akafugu_core https://raw.githubusercontent.com/akafugu/akafugu_core/master/package_akafugu_index.json /src/ master
Alorium XLR8 Boards alorium avr https://github.com/AloriumTechnology/Arduino_Boards https://raw.githubusercontent.com/AloriumTechnology/Arduino_Boards/master/package_aloriumtech_index.json Package is only in archive file.
AmbaSat-1 Satellite Board AmbaSat-1 avr https://ambasat.com/boards/package_ambasat-1.com_index.json
Aquila Boards makerlab avr https://github.com/makerlabmx/altair-arduinoide http://makerlabmx.github.io/altair-arduinoide/package_makerlabmx_index.json /avr/ master
Arachnid Labs AVR boards arachnidlabs avr https://github.com/arachnidlabs/arachnidlabs-boards https://raw.githubusercontent.com/arachnidlabs/arachnidlabs-boards/master/package_arachnidlabs.com_boards_index.json / master
Arbotix AVR Boards arbotix avr https://github.com/tician/arbotix https://tician.github.io/arbotix/package_trossen_arbotix_index.json /hardware/arbotix/avr/ arduino-1.8 Fork of https://github.com/vanadiumlabs/arbotix, which is even less actively maintained
Ardhat AVR Boards ardhat avr https://github.com/Ardhat/ardhat.github.io https://ardhat.github.io/ardhat-board-support/arduino/package_ardhat_index.json /ardhat-board-support/arduino/ardhat-1.0.0/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release.
Arduboy arduboy avr https://github.com/Arduboy/arduboy.github.io https://arduboy.github.io/board-support/package_arduboy_index.json /board-support/arduboy-1.0.0/ master
ArduCAM_ESP32S_UNO ArduCAM_ESP32S_UNO esp32 https://github.com/ArduCAM/ArduCAM_ESP32S_UNO http://www.arducam.com/downloads/ESP32_UNO/package_ArduCAM_ESP32S_UNO_index.json / master
ArduCAM_ESP8266_UNO ArduCAM_ESP8266_UNO ArduCAM_ESP8266_UNO https://github.com/ArduCAM/ArduCAM_ESP8266_UNO http://www.arducam.com/downloads/ESP8266_UNO/package_ArduCAM_index.json / master
Arduinex avr https://github.com/Team254/Arduinex / master
Arduino ARM (32-bits) Boards https://github.com/ultimachine/FeynmanCore / master
Arduino ARM (32-bits) Boards (arcore) arcore sam https://github.com/rkistner/arcore /hardware/sam/ master
Arduino AVR Boards archiduino avr https://github.com/Bisotronic/archiduino1284BT / master
Arduino AVR Boards archiduino avr https://github.com/Bisotronic/archiduino_1.8.5 /avr/ master
Arduino AVR Boards arduino avr https://github.com/arduino/ArduinoCore-avr https://downloads.arduino.cc/packages/package_index.json / master
Arduino AVR Boards (arcore) arcore avr https://github.com/rkistner/arcore /hardware/avr/ master
Arduino Library for Sasquatch Robot Controller sasquatch avr https://github.com/221robotics/RobotOpen-Sasquatch-Library /hardware/sasquatch/avr/ master
Arduino megaAVR Boards arduino megaavr https://github.com/arduino/ArduinoCore-megaavr https://downloads.arduino.cc/packages/package_index.json / master
Arduino NavSpark Boards navspark navspark http://navspark.mybigcommerce.com/content/package_navspark_index.json
Arduino NRF52 Boards arduino nrf52 https://github.com/arduino/ArduinoCore-primo / master
Arduino nRF528x Boards (Mbed OS) arduino mbed https://github.com/arduino/ArduinoCore-nRF528x-mbedos https://downloads.arduino.cc/packages/package_index.json / master Nano 33 BLE/Sense
Arduino SAM Boards (32-bits ARM Cortex-M3) arduino sam https://github.com/arduino/ArduinoCore-sam https://downloads.arduino.cc/packages/package_index.json / master
Arduino SAMD Boards (32-bits ARM Cortex-M0+) arduino samd https://github.com/arduino/ArduinoCore-samd https://downloads.arduino.cc/packages/package_index.json / master
Arduino STM32F4 Boards arduino stm32f4 https://github.com/bcmi-labs/arduino-core-stm32f4 / master
Arduino-AVRISPmkII-workaround Arduino-AVRISPmkII-fix avr https://github.com/per1234/Arduino-AVRISPmkII-fix https://per1234.github.io/Arduino-AVRISPmkII-fix/package_per1234_Arduino-AVRISPmkII-fix_index.json /avr/ master Programmer definition for a workaround for an AVRISP mkII programmer issue that likely doesn't occur anymore.
Arduino-compatible AVR Boards GEKOnavsat avr https://github.com/GEKONavsat/Kyneo1 / master
Arduino-compatible AVR Boards GEKOnavsat avr https://github.com/GEKONavsat/Kyneo2 / master
arduino-esp8266-deauther (modified for ARM Linux support) deauther esp8266 https://github.com/tobozo/Arduino https://raw.githubusercontent.com/wiki/tobozo/Arduino/package_deauther_index.json / deauther https://github.com/spacehuhn/esp8266_deauther/wiki/Installation#compiling-using-arduino-ide
Arduino-Tiny avr https://github.com/Coding-Badly/arduino-tiny / master Unmaintained. Originally hosted at: https://code.google.com/archive/p/arduino-tiny/
Ariadne Bootloader ariadne avr https://github.com/loathingKernel/ariadne-bootloader / master
Ariadne Bootloader ariadne avr https://github.com/codebndr/Ariadne-Bootloader /hardware/ariadne/avr/ master This was the original repository for Ariadne, but the active repository is now https://github.com/loathingKernel/ariadne-bootloader
Ariadne Bootloader Ariadne-Bootloader avr https://github.com/per1234/Ariadne-Bootloader https://per1234.github.io/Ariadne-Bootloader/package_codebendercc_ariadne-bootloader_index.json / ariadne Outdated fork of https://github.com/loathingKernel/ariadne-bootloader, but with Boards Manager installation support
Arrow Boards Arrow samd https://github.com/ioteamit/smarteverything-core https://raw.githubusercontent.com/ioteamit/smarteverything-core/master/package_arrow_index.json / master The package is also listed in https://downloads.arduino.cc/packages/package_index.json
atflash atflash avr https://mesom.de/atflash/package_atflash_index.json
ATmega168P/328P Boards megax8 avr https://github.com/leomil72/megax8 https://www.leonardomiliani.com/repository/package_leonardomiliani.com_index.json /avr/ master
ATmega328PB ATmega328PB-incl-Bootloader avr https://github.com/0x6470/ATmega328PB-Arduino-Nano-Clone-with-Bootloader https://github.com/dprinz4/ATmega328PB-Arduino-Nano-Clone-with-Bootloader/raw/master/package_m328pb_index.json /src/avr/ master
ATmega32U4asISP ATmega32U4asISP avr https://github.com/per1234/ATmega32U4asISP https://per1234.github.io/ATmega32U4asISP/package_per1234_ATmega32U4asISP_index.json /avr/ master Programmer definition for a workaround for an issue with the Arduino as ISP on an ATmega32U4 board. This will be obsolete once Arduino releases the version of Arduino AVR Boards that contains the 'Arduino as ISP (ATmega32U4)' programmer definition.
ATmega644P/1284P Boards megax4 avr https://github.com/leomil72/megax4 https://www.leonardomiliani.com/repository/package_leonardomiliani.com_index.json /avr/ master
ATmegaM1-C1 ATmegaM1-C1 avr https://github.com/thomasonw/ATmegaxxM1-C1 https://thomasonw.github.io/ATmegaxxM1-C1/package_thomasonw_ATmegaxxM1-C1_index.json /avr/ master
Atmel AVR Xplained-minis atmel-avr-xminis avr https://github.com/AtmelUniversityFrance/atmel-avr-xmini-boardmanagermodule https://downloads.arduino.cc/packages/package_index.json /module/ master
attiny attiny avr https://github.com/damellis/attiny https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json / master
ATtiny extra Boards tiny avr https://github.com/leomil72/tiny https://www.leonardomiliani.com/repository/package_leonardomiliani.com_index.json /avr/ master
ATtiny Modern arduino-tiny-841 avr https://github.com/SpenceKonde/arduino-tiny-841 http://drazzy.com/package_drazzy.com_index.json /avr/ master Has been merged into SpenceKonde/ATTinyCore.
ATTinyCore ATTinyCore avr https://github.com/SpenceKonde/ATTinyCore http://drazzy.com/package_drazzy.com_index.json /avr/ master
avr_boot avr_boot avr https://github.com/zevero/avr_boot https://zevero.github.io/avr_boot/package_zevero_avr_boot_index.json /avr/ gh-pages SD bootloader.
Azure Sphere WizIO azure https://github.com/Wiz-IO/framework-azure https://raw.githubusercontent.com/Wiz-IO/arduino-azure-sphere/master/package_wizio.azure_index.json /arduino/ master
Balanduino Balanduino avr https://github.com/TKJElectronics/Balanduino https://raw.githubusercontent.com/TKJElectronics/Balanduino/master/package_tkj_balanduino_index.json /Firmware/hardware/Balanduino/avr/ master
Barebones ATmega Chips (no bootloader) atmega avr https://github.com/carlosefr/atmega https://raw.githubusercontent.com/carlosefr/atmega/master/package_carlosefr_atmega_index.json /avr/ master
BayEOS AVR Boards BayEOS avr https://github.com/BayCEER/BayEOS-Arduino https://raw.githubusercontent.com/BayCEER/BayEOS-Arduino/master/package_BayEOS_index.json / master
BirdBrain Technologies BirdBrain Technologies avr https://github.com/BirdBrainTechnologies/BirdBrain-Arduino-Libraries https://raw.githubusercontent.com/BirdBrainTechnologies/BirdBrain-Arduino-Libraries/master/package_bbtech_index.json /bbtech-avr-1.1.0/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release.
bitDuino10-aTPI bitDuino10-aTPI avr https://github.com/kimio-kosaka/bitDuino10-arduinoTPI https://kimio-kosaka.github.io/bitDuino10-arduinoTPI/package_bitDuino10-arduinoTPI_index.json / master ATtiny10
Blinks move38 avr https://github.com/Move38/Blinks-SDK https://raw.githubusercontent.com/Move38/Blinks-SDK/master/package_move38.com-blinks_index.json / dev There's also https://github.com/bigjosh/Move38-Arduino-Platform, and it's not clear which one should be checked
Bluno M0 MainBoard & DFRduino M0 MainBoard nucDuino nucDuino https://github.com/DFRobot/DFRobotDuinoBoard https://raw.githubusercontent.com/DFRobot/DFRobotDuinoBoard/master/package_dfrobot_index.json Package is only in archive file.
Breadboard Arduino Breadboard Arduino avr https://github.com/oshlab/Breadboard-Arduino https://raw.githubusercontent.com/oshlab/Breadboard-Arduino/master/avr/boardsmanager/package_oshlab_breadboard_index.json /avr/ master
ButterflyCore ButterflyCore avr https://github.com/MCUdude/ButterflyCore /avr/ master
Calunium calunium avr https://github.com/stevemarple/Calunium /software/arduino-1.6/calunium/avr/ master
CANBus Triple CANBus-Triple avr https://github.com/synman/CANBus-Triple_Genesis-Connect /avr/ master
Canique MKx canique avr https://resources.canique.com/ide/package_canique_index.json
chipKIT chipKIT pic32 https://github.com/chipKIT32/chipKIT-core https://github.com/chipKIT32/chipKIT-core/raw/master/package_chipkit_index.json /pic32/ master
Circuit Monkey avr https://github.com/CircuitMonkey/arduino-boards /avr/ master
clkdiv8 Sparrow Boards clkdiv8 avr http://clkdiv8.com/download/package_clkdiv8_index.json
Cosa Cosa avr https://github.com/mikaelpatel/Cosa https://raw.githubusercontent.com/mikaelpatel/Cosa/master/package_cosa_index.json / master
Custom Blackfin boards deanm1278 bfin https://github.com/deanm1278/ArduinoCore-blackfin / master
Custom STM32duino Boards vendor stm32 https://github.com/RickKimball/vendor /stm32/ master Custom stm32 bluepill board based on the official STM Arduino core
Cytron ARM Boards cytron arm https://github.com/CytronTechnologies/CT-ARM https://cytrontechnologies.github.io/package_cytron_index.json / master
Cytron AVR Boards cytron avr https://github.com/CytronTechnologies/CytronTechnologies.github.io https://cytrontechnologies.github.io/package_cytron_index.json Package is only in archive file.
dadamachines - M0 Boards (dependency: Arduino SAMD Boards 1.6.9) dadamachines - M0 samd https://github.com/dadamachines/automat https://dadamachines.github.io/arduino-board-index/package_dadamachines-m0_index.json /software/arduino/hardware/dadmachines-automat/samd/ master
dadamachines - M4 Boards (dependency: Adafruit SAMD Boards 1.3.0) dadamachines - M4 samd https://github.com/dadamachines/ArduinoCore-samd https://dadamachines.github.io/arduino-board-index/package_dadamachines-m4_index.json / master
Digistump AVR Boards digistump avr https://github.com/digistump/DigistumpArduino http://digistump.com/package_digistump_index.json /digistump-avr/ master
Digistump AVR Boards digistump avr https://github.com/ArminJo/DigistumpArduino https://raw.githubusercontent.com/ArminJo/DigistumpArduino/master/package_digistump_index.json /digistump-avr/ master Hard fork of digistump/DigistumpArduino
Digistump SAM Boards (32-bits ARM Cortex-M3) digistump sam https://github.com/digistump/DigistumpArduino http://digistump.com/package_digistump_index.json /digistump-sam/ master
DIY ATtiny diy_attiny avr https://github.com/sleemanj/ATTinyCore https://raw.githubusercontent.com/sleemanj/optiboot/master/dists/package_gogo_diy_attiny_index.json /avr/ master Hard fork of SpenceKonde/ATTinyCore. It's apparently mirrored at https://github.com/sleemanj/optiboot, which is where the installation files are stored.
Dwenguino dwenguino avr http://www.dwengo.org/sites/default/files/package_dwengo.org_dwenguino_index.json
EBots EBots avr https://github.com/sanu-krishnan/ebot-arduino-core https://raw.githubusercontent.com/sanu-krishnan/ebot-arduino-core/master/package_ebots.cc_index.json /avr/ master
Electronic Cats SAMD Boards electroniccats samd https://github.com/ElectronicCats/Arduino_Boards_Index https://electroniccats.github.io/Arduino_Boards_Index/package_electroniccats_index.json /electroniccats/samd/ gh-pages
Elektor AVR boards Elektor avr https://github.com/ElektorLabs/arduino https://github.com/ElektorLabs/Arduino/releases/download/v1.0.1/package_elektor_index.json /source/avr/ master
Elektor Labs avr https://github.com/ElektorLabs/arduino /source2/avr/ master Unclear what the point of this folder is. Contains Elektor Uno R4 boards definitions (with build.mcu set to atmega328p), but those are also in source/avrpb (with build.mcu set to atmega328pb)
Elektor Uno R4 (with ATmega328PB) Elektor-Uno-R4 avr https://github.com/ElektorLabs/arduino https://github.com/ElektorLabs/Arduino/releases/download/v1.0.1/package_elektor_uno_r4_1_8_x_index.json /source/avrpb/ master
Elemon Arduino Boards EESA-IOT 5.0 v1 samd https://github.com/MauricioJancic/Elemon https://raw.githubusercontent.com/MauricioJancic/Elemon/master/package_Elemon_index.json Package is only in archive file.
EMORO 2560 emoro avr https://downloads.arduino.cc/packages/package_index.json
Engimusing ARM EFM32 Boards engimusing efm32 https://github.com/Engimusing/engimusing.github.io https://engimusing.github.io/arduinoIDE/package_engimusing_modules_index.json /arduinoIDE/efm48_1/1.0.1/ master
EnviroDIY ATmega Boards EnviroDIY avr https://github.com/EnviroDIY/Arduino_boards https://raw.githubusercontent.com/EnviroDIY/Arduino_boards/master/package_EnviroDIY_index.json /envirodiyboards/ master
ESP31B Modules espressif ESP31B https://github.com/me-no-dev/ESP31B / master
esp32 esp32 esp32 https://github.com/espressif/arduino-esp32 https://dl.espressif.com/dl/package_esp32_index.json / master
esp8266 esp8266 esp8266 https://github.com/esp8266/Arduino https://arduino.esp8266.com/stable/package_esp8266com_index.json / master
esp8266 esp8266 esp8266 https://raw.githubusercontent.com/DFRobot/DFRobotDuinoBoard/master/package_dfrobot_iot_mainboard.json This contains a definition for what appears to be a modified version of ESP8266 core for Arduino 2.3.0 (different SHA-256 from the official package archive file) that is supposed to download from http://192.168.1.57/esp8266-2.3.0.zip.
Etherkit SAMD Boards etherkit samd https://github.com/etherkit/ArduinoBoards https://github.com/etherkit/ArduinoBoards/raw/master/package_etherkit_index.json /etherkit-samd-1.0.0/ master For the 'Empyrean' boards. The use of a version number in the folder name will make Repository Data Folder outdated on every release.
Extra MCU support for Arduino IDE arduino avr https://github.com/sumotoy/Extra_MCU_support_for_Arduino_IDE /hardware/arduino/ master
FemtoCow ATTiny FemtoCow-attiny avr https://github.com/FemtoCow/ATTinyCore https://raw.githubusercontent.com/FemtoCow/ATTinyCore/master/Downloads/package_femtocow_attiny_index.json /tiny/ master
FireBeetle-ESP32 Mainboard esp32 DFRobot_FireBeetle-ESP32 https://github.com/DFRobot/FireBeetle-ESP32 https://git.oschina.net/dfrobot/FireBeetle-ESP32/raw/master/package_esp32_index.json Package is only in archive file.
FireBeetle-ESP8266 firebeetle8266 firebeetle8266 https://github.com/DFRobot/FireBeetle-ESP8266 https://github.com/DFRobot/FireBeetle-ESP8266/raw/master/package_firebeetle8266_index.json Package is only in archive file.
FirePick Delta Bootloaders for Arduino IDE fpd-arduino-bootloaders avr https://github.com/firepick-delta/fpd-arduino-bootloaders / master
Freaklabs ATMega1284P Boards Freaklabs avr https://github.com/freaklabs/freaklabs-boards https://raw.githubusercontent.com/freaklabs/freaklabs-boards/master/package_freaklabs_index.json /boards/1.0.3/ master
ftDuino ftduino avr https://github.com/harbaum/ftduino https://raw.githubusercontent.com/harbaum/ftduino/master/package_ftduino_index.json /ftduino/ master
Generation_7_Electronics Gen7-dist avr https://github.com/Traumflug/Generation_7_Electronics /arduino%20support/Gen7-dist/ master
Goldilocks Goldilocks avr https://github.com/feilipu/Arduino_Goldilocks_Variant https://raw.githubusercontent.com/feilipu/feilipu.github.io/master/package_goldilocks_index.json / master
grayduino grayduino avr https://github.com/colinta/grayduino https://raw.githubusercontent.com/colinta/grayduino/json/package_colinta_grayduino_index.json / master ATmega32U4
Grove AI HAT for Edge Computing Seeeduino riscv64 https://github.com/Seeed-Studio/ArduinoCore-k210 https://raw.githubusercontent.com/Seeed-Studio/Seeed_Platform/master/package_seeeduino_boards_index.json / kendryte-standalone-sdk There are multiple branches that seem to be different variants and it's unclear what they're for. kendryte-standalone-sdk is the default branch.
GyverCore GyverCore avr https://github.com/AlexGyver/GyverCore https://alexgyver.github.io/package_GyverCore_index.json /GyverCore/ master Fast and light Arduino core for Atmega328
HidnSeek HidnSeek avr https://github.com/hidnseek/hidnseek http://hidnseek.github.io/hidnseek/package_hidnseek_boot_index.json /arduino/ master
HoodLoader2 HoodLoader2 avr https://github.com/NicoHood/HoodLoader2 https://raw.githubusercontent.com/NicoHood/HoodLoader2/master/package_NicoHood_HoodLoader2_index.json /avr/ dev206
Industruino SAMD Boards (32-bits ARM Cortex-M0+) industruino samd https://github.com/Industruino/IndustruinoSAMD https://static.industruino.com/downloads/code/IndustruinoCores/IndustruinoSAMD/pkgdef/package_industruino_samd_index.json / master Package is also listed in https://downloads.arduino.cc/packages/package_index.json
Infineon's XMC Microcontroller Infineon arm https://github.com/Infineon/XMC-for-Arduino https://github.com/Infineon/Assets/releases/download/current/package_infineon_index.json /arm/ develop
InoAVRDragon InoAVRDragon avr https://github.com/per1234/InoAVRDragon https://per1234.github.io/InoAVRDragon/package_per1234_InoAVRDragon_index.json /avr/ master AVR Dragon programmer definition
InoPlatformPropertiesTest InoPlatformPropertiesTest dummy_architecture https://github.com/per1234/InoPlatformPropertiesTest /dummy_architecture/ master Dummy Arduino hardware package for testing how properties and recipes are handled.
Intel Curie Boards Intel arc32 https://github.com/arduino/ArduinoCore-arc32 https://downloads.arduino.cc/packages/package_index.json / master
Intel i586 Boards Intel i586 https://github.com/intel/corelibs-galileo https://downloads.arduino.cc/packages/package_index.json / master
Intel i686 Boards Intel i686 https://github.com/intel/corelibs-edison https://downloads.arduino.cc/packages/package_index.json / master
IntoRobot ESP Boards intorobot esp8266 https://github.com/IntoRobot/IntoRobotPackages-ArduinoIDE https://github.com/IntoRobot/IntoRobotPackages-ArduinoIDE/releases/download/1.0.0/package_intorobot_index.json Package is only in archive file (on the release page).
IntoRobot STM32 Boards intorobot stm32 https://github.com/IntoRobot/IntoRobotPackages-ArduinoIDE https://github.com/IntoRobot/IntoRobotPackages-ArduinoIDE/releases/download/1.0.0/package_intorobot_index.json Package is only in archive file (on the release page).
IOTEAM Boards IOTEAM samd https://github.com/ioteamit/ioteam-arduino-core https://raw.githubusercontent.com/ioteamit/ioteam-arduino-core/master/package_ioteam_index.json / master
Iteaduino Lite iteaduino_lite avr https://github.com/udif/ITEADSW_Iteaduino-Lite-HSP https://raw.githubusercontent.com/udif/ITEADSW_Iteaduino-Lite-HSP/master/package/package_iteaduino_lite_index.json hardware/LGT/LGT8F/ master
Jewelbots Arduino Library Jewelbots_Arduino_Library nRF51822 https://github.com/Jewelbots/arduino-library https://jewelbots.github.io/arduino-library/package_jewelbots_index.json /jewelbots_solo_mode_v117/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release.
JN516x Boards intiki jn516x https://github.com/soburi/JN516x-arduino-package http://soburi.github.io/JN516x-arduino-package/package_soburi_intiki_index.json / master
Keyboardio Keyboards Kaleidoscope-Bundle-Keyboardio avr https://github.com/keyboardio/Kaleidoscope-Bundle-Keyboardio /avr/ master
Konekt Dash/Dash Pro Boards konekt sam http://downloads.hologram.io/arduino/package_konekt_index.json Konekt is now hologram.io
Laika laika_arduino avr https://github.com/eightdog/laika_arduino https://raw.githubusercontent.com/eightdog/laika_arduino/master/IDE_Board_Manager/package_project_laika.com_index.json Package is only in archive file (on the release page).
Larduino_HSP LGT avr https://github.com/LGTMCU/Larduino_HSP /hardware/LGT/avr/ master
Lattuino 1 Lattuino avr https://github.com/INTI-CMNB/Lattuino_IP_Core http://fpgalibre.sf.net/Lattuino/package_lattuino_index.json /ide/ master
Leonardo & Micro MIDI-USB (arcore) arcore avr https://adafruit.github.io/arduino-board-index/package_adafruit_index.json This is based on https://github.com/rkistner/arcore/tree/master/hardware/avr, but it seems Adafruit made some changes to it and I can't find the repository that contains this specific version of the hardware package
LGT8fx Boards LGT8fx Boards avr https://github.com/dbuezas/lgt8fx https://raw.githubusercontent.com/dbuezas/lgt8fx/master/package_lgt8fx_index.json /lgt8f/ master
LinkIt 7697 LinkIt linkit_rtos https://github.com/MediaTek-Labs/Arduino-Add-On-for-LinkIt-SDK http://download.labs.mediatek.com/package_mtk_linkit_7697_index.json /middleware/third_party/arduino/hardware/arduino/mt7697/ master
LinkIt ONE LinkIt arm http://download.labs.mediatek.com/package_mtk_linkit_index.json
littleBits Arduino AVR Modules littleBits avr https://downloads.arduino.cc/packages/package_index.json
LoRaNodes M0 Boards LoRaNodes M0 Boards samd https://github.com/loranodes/arduino-core https://raw.githubusercontent.com/loranodes/arduino-core/master/package_loranodes_index.json /microNode/ master
Macchina SAM Boards macchina sam https://github.com/macchina/arduino-boards-sam https://macchina.cc/package_macchina_index.json /sam/ master
Maixduino(k210) Maixduino k210 https://github.com/sipeed/Maixduino http://dl.sipeed.com/MAIX/Maixduino/package_Maixduino_k210_index.json / master There is a mirror of the JSON file at http://dl.sipeed.com/MAIX/Maixduino/package_Maixduino_k210_dl_cdn_index.json
MajorCore MajorCore avr https://github.com/MCUdude/MajorCore https://mcudude.github.io/MajorCore/package_MCUdude_MajorCore_index.json /avr/ master
Marlin AVR Boards anet avr https://github.com/SkyNet3D/anet-board /hardware/anet/avr/ master For Anet 3D printer boards.
MattairTech AVR Boards MattairTech_Arduino avr https://github.com/mattairtech/ArduinoCore-avr https://www.mattairtech.com/software/arduino/package_MattairTech_index.json / master
MattairTech SAM D|L|C core for Arduino MattairTech_Arduino samd https://github.com/mattairtech/ArduinoCore-samd https://www.mattairtech.com/software/arduino/package_MattairTech_index.json / master
Maxim's 32-bit Microcontroller Maxim arm https://github.com/MaximIntegratedMicros/arduino-max326xx https://raw.githubusercontent.com/MaximIntegratedMicros/arduino-collateral/master/package_maxim_index.json /arm/ master
MCCI Catena SAMD Boards mcci samd https://github.com/mcci-catena/ArduinoCore-samd https://github.com/mcci-catena/arduino-boards/raw/master/BoardManagerFiles/package_mcci_index.json / master
MCCI Catena STM32 Boards mcci stm32 https://github.com/mcci-catena/Arduino_Core_STM32 https://github.com/mcci-catena/arduino-boards/raw/master/BoardManagerFiles/package_mcci_index.json / master
MCCI Connection Exerciser mcci avr https://github.com/mcci-catena/arduino-boards https://github.com/mcci-catena/arduino-boards/raw/master/BoardManagerFiles/package_mcci_index.json
MediaTek LinkIt Smart Boards LinkIt avr http://download.labs.mediatek.com/package_mtk_linkit_smart_7688_index.json
Meet je stad! AVR Boards meetjestad avr https://github.com/meetjestad/mjs_boards https://github.com/meetjestad/mjs_boards/raw/master/package_meetjestad.net_index.json /avr/ master
mega1284duino mega1284duino avr https://github.com/cano64/mega1284duino / master
MegaCore MegaCore avr https://github.com/MCUdude/MegaCore https://mcudude.github.io/MegaCore/package_MCUdude_MegaCore_index.json /avr/ master
MegaCoreX MegaCoreX megaavr https://github.com/MCUdude/MegaCoreX /megaavr/ master
megaTinyCore megaTinyCore megaavr https://github.com/SpenceKonde/megaTinyCore http://drazzy.com/package_drazzy.com_index.json /megaavr/ master
MH-ET LIVE Boards avr https://github.com/MHEtLive/MHEtLiveArduino /mhetlive-avr-1.0.0/1.0.0/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release.
MicroBridge-Arduino-ATMega2560 microbridge avr https://github.com/FleetProbe/MicroBridge-Arduino-ATMega2560 /hardware/microbridge/avr/ master Modified BootLoader to load firmware from sd or flash on ATmega2560
MicroCore MicroCore avr https://github.com/MCUdude/MicroCore https://mcudude.github.io/MicroCore/package_MCUdude_MicroCore_index.json /avr/ master
Microduino-IDE-Support Microduino avr https://github.com/wasdpkj/Microduino-IDE-Support /hardware/Microduino/avr/ master
Microduino-IDE-Support Microduino esp32 https://github.com/wasdpkj/Microduino-IDE-Support /hardware/Microduino/esp32/ master
microUPDIcore microUPDIcore avr https://github.com/MCUdude/microUPDIcore /avr/ master Dummy package used to flash the mEDBG firmware.
Mighty 1284P avr https://github.com/maniacbug/mighty-1284p/ / master Unmaintained, replaced by https://github.com/JChristensen/mighty-1284p
Mighty-1284p Boards mighty-1284p avr https://github.com/JChristensen/mighty-1284p /avr/ v1.6.3
mighty-1284p-freaklabs mighty-1284p-freaklabs avr https://github.com/DgFutureLab/satoyama-libs /mighty-1284p-freaklabs/ master
MightyCore MightyCore avr https://github.com/MCUdude/MightyCore https://mcudude.github.io/MightyCore/package_MCUdude_MightyCore_index.json /avr/ master
Mini SAM (32-bit ARM Cortex-M0+) Boards mini_sam samd https://github.com/bwshockley/Minifigure-SAMD21E /arduino/mini_sam/hardware/samd/2.0.0/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release.
MiniCore MiniCore avr https://github.com/MCUdude/MiniCore https://mcudude.github.io/MiniCore/package_MCUdude_MiniCore_index.json /avr/ master
Mobillyo Mobillyo avr https://github.com/Seenov/mobillyo https://raw.githubusercontent.com/Seenov/mobillyo/master/arduino-board-index/package_seenov_index.json /mobillyo-board-files/seenov/hardware/avr/1.0.0/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release.
Moteino Moteino avr https://github.com/LowPowerLab/LowPowerLab.github.io https://raw.githubusercontent.com/LowPowerLab/LowPowerLab.github.io/master/MoteinoCore/package_LowPowerLab_index.json Package is only in archive file.
Moteino AVR Boards Moteino avr https://github.com/LowPowerLab/LowPowerLab.github.io https://lowpowerlab.github.io/MoteinoCore/package_LowPowerLab_index.json Package is only in archive file
Moteino SAMD Boards Moteino samd https://github.com/LowPowerLab/LowPowerLab.github.io https://lowpowerlab.github.io/MoteinoCore/package_LowPowerLab_index.json Package is only in archive file
MXChip - Microsoft Azure IoT Developer Kit AZ3166 stm32f4 https://github.com/microsoft/devkit-sdk https://raw.githubusercontent.com/VSChina/azureiotdevkit_tools/master/package_azureboard_index.json /AZ3166/src/ master
MySensors AVR based boards mysensors avr https://github.com/mysensors/ArduinoHwAVR / master
NekuNeko SAMD Boards nekuneko samd https://github.com/nekuneko/NekuNeko_Arduino_Boards https://nekuneko.github.io/arduino-board-index/package_nekuneko_index.json / master
Nordic Semiconductor nRF5 Boards sandeepmistry nRF5 https://github.com/sandeepmistry/arduino-nRF5 https://sandeepmistry.github.io/arduino-nRF5/package_nRF5_boards_index.json / master
Northern Widget 'ALog' AVR Boards NorthernWidget avr https://github.com/NorthernWidget/Arduino_Boards https://raw.githubusercontent.com/NorthernWidget/Arduino_Boards/master/package_NorthernWidget_index.json /NorthernWidgetAVR/ master
Nufront tl7788 (32-bits) Boards https://github.com/hunianhang/arduino_nufront / master They also have https://github.com/hunianhang/tl7788_arduino
Oak by Digistump digistump oak https://github.com/digistump/OakCore https://raw.githubusercontent.com/digistump/arduino-boards-index/master/package_digistump_index.json / master
ODROID hardkernel odroid https://github.com/hhk7734/oduino / master ODROID SBCs
Olimex AVR boards Olimex avr https://github.com/OLIMEX/Arduino_configurations https://raw.githubusercontent.com/OLIMEX/Arduino_configurations/master/AVR/package_olimex_avr_index.json Package is only in archive file.
Olimex PIC boards Olimex pic https://github.com/OLIMEX/Arduino_configurations https://raw.githubusercontent.com/OLIMEX/Arduino_configurations/master/PIC/package_olimex_pic_index.json
Olimex STM boards Olimex stm https://github.com/OLIMEX/Arduino_configurations https://raw.githubusercontent.com/OLIMEX/Arduino_configurations/master/STM/package_olimex_stm_index.json
OMC OMC avr https://github.com/ThamesValleyReprapUserGroup/Beta-TVRRUG-Mendel90 https://raw.githubusercontent.com/ThamesValleyReprapUserGroup/Beta-TVRRUG-Mendel90/master/Added-Documents/OMC/package_omc_index.json Package is only in archive file.
Omzlo AVR Boards omzlo avr https://github.com/omzlo/omzlo-one-arduino-package https://raw.githubusercontent.com/omzlo/omzlo-one-arduino-package/master/package_omzlo.com_index.json /src/ master
Open Panzer AVR Boards OpenPanzer avr https://github.com/OpenPanzerProject/OpenPanzerBoards https://openpanzerproject.github.io/OpenPanzerBoards/package_openpanzer_index.json /avr/ master
OpenChronograph OC-1 Arduino_OpenChronograph_OC1 avr https://github.com/snietfeld/OpenChronograph /MainBoards/oc_1/hw/Arduino_OpenChronograph_OC1/avr/ master
OpenCM9.04 OpenCM904 OpenCM904 https://github.com/ROBOTIS-GIT/OpenCM9.04 https://raw.githubusercontent.com/ROBOTIS-GIT/OpenCM9.04/master/arduino/opencm_release/package_opencm9.04_index.json /arduino/opencm_arduino/opencm9.04/ develop
OpenCR OpenCR OpenCR https://github.com/ROBOTIS-GIT/OpenCR https://raw.githubusercontent.com/ROBOTIS-GIT/OpenCR/master/arduino/opencr_release/package_opencr_index.json /arduino/opencr_arduino/ develop
OpenTracker Boards (32-bits ARM Cortex-M3) opentracker sam https://github.com/geolink/opentracker-arduino-board https://raw.githubusercontent.com/geolink/opentracker-arduino-board/master/package_opentracker_index.json /sam/1.0.5/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release.
Optiboot 8.0 Optiboot avr https://github.com/Optiboot/optiboot https://github.com/Optiboot/optiboot/releases/download/v8.0/package_optiboot_optiboot-additional_index.json /optiboot/ master The current Boards Manager system is to attach a JSON file to each release, which would change the Boards Manager URL on every release.
P1AM-100 P1AM-100 samd https://github.com/facts-engineering/P1AMCore https://raw.githubusercontent.com/facts-engineering/facts-engineering.github.io/master/package_productivity-P1AM-boardmanagermodule_index.json / master
panStamp AVR w/ Atmega328p panstamp_avr avr https://github.com/panStamp/arduino_avr http://panstamp.org/arduino/package_panstamp_index.json / master
panStamp NRG w/ CC430F5137 panstamp_nrg msp430 https://github.com/panStamp/arduino_nrg http://panstamp.org/arduino/package_panstamp_index.json / master
Philduino AVR Boards philduino avr https://github.com/Jackjan4/PhilduinoArduino https://raw.githubusercontent.com/Jackjan4/PhilduinoArduino/master/package_philduino_index.json /hardware/avr/1.0.1/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release.
Pololu A-Star Boards pololu-a-star avr https://github.com/pololu/a-star https://files.pololu.com/arduino/package_pololu_index.json / master
PulseRain Rattlesnake PulseRain_RISCV Rattlesnake https://github.com/PulseRain/Arduino_RISCV_IDE https://raw.githubusercontent.com/PulseRain/Arduino_RISCV_IDE/master/package_pulserain.com_index.json /PulseRain_RISCV/Rattlesnake/ master
PulseRain Reindeer PulseRain_RISCV Reindeer https://github.com/PulseRain/Arduino_RISCV_IDE https://raw.githubusercontent.com/PulseRain/Arduino_RISCV_IDE/master/package_pulserain.com_index.json /PulseRain_RISCV/Rattlesnake/ master
qqqlabBoard myboard avr https://qqqlab.github.io/rfm69-arduino/package_qqqlab_index.json Looks to be just a personal project board with no hardware source files available.
Quectel BC66 WizIO bc66 https://github.com/Wiz-IO/Arduino-Quectel-BC66 http://wizio.eu/arduino/bc66/package_wizio.bc66_index.json / master
Quectel M66 WizIO m66 https://github.com/Wiz-IO/Arduino-Quectel-M66 https://raw.githubusercontent.com/Wiz-IO/Arduino-Quectel-M66/master/tools/package_wizio.m66_index.json / master
Quirkbot AVR Boards quirkbot avr https://github.com/Quirkbot/QuirkbotArduinoHardware https://raw.githubusercontent.com/Quirkbot/QuirkbotArduinoHardware/master/package_quirkbot.com_index.json /avr/ master
radino In-Circuit avr http://library.radino.cc/Arduino_1_8/package_radino_radino32_index.json
radino32 In-Circuit STM32L1 http://library.radino.cc/Arduino_1_8/package_radino_radino32_index.json
radinoL4 (beta) In-Circuit STM32L4 http://library.radino.cc/Arduino_1_8/package_radino_radino32_index.json
Rainboard-cores Rainboard avr https://github.com/mluthfialhadi/mluthfialhadi.github.io https://raw.githubusercontent.com/mluthfialhadi/mluthfialhadi.github.io/Rainboard-Board-Manager/Rainboard/rainboard_list.json /Rainboard/Rainboard-Board-Manager/ Rainboard-Board-Manager
RaspberryPi RaspberryPi piduino https://github.com/me-no-dev/RasPiArduino / master
Realtek Ameba Boards (32-bits ARM Cortex-M3) realtek ameba https://github.com/Ameba8195/Arduino https://github.com/Ameba8195/Arduino/raw/master/release/package_realtek.com_ameba_index.json /hardware_v2/ master
RedBear AVR Boards RedBear avr https://github.com/RedBearLab/Blend https://redbearlab.github.io/arduino/package_redbearlab_index.json /Arduino/hardware/blend/avr/ master
RedBear Duo (32-bits ARM Cortex-M3) RedBear STM32F2 https://github.com/RedBearLab/redbearlab.github.io https://redbearlab.github.io/arduino/package_redbear_index.json
RedBear nRF51822 Boards (32-bits ARM Cortex-M0) RedBear nRF51822 https://github.com/redbear/nRF5x https://redbear.github.io/arduino/package_redbear_nRF5x_index.json /nRF51822/arduino/arduino-1.6.x/hardware/RBL/RBL_nRF51822/ master
RedBear nRF52832 Boards (32-bits ARM Cortex-M4F) RedBear nRF52832 https://github.com/redbear/nRF5x https://redbear.github.io/arduino/package_redbear_nRF5x_index.json /nRF52832/arduino/arduino-1.8.0/hardware/RBL/RBL_nRF52832/ master
RFduino Boards RFduino RFduino https://github.com/RFduino/RFduino / master The Boards Manager JSON URL is dead and their website is trashed so maybe the project is abandoned? The JSON file can be viewed here: http://web.archive.org/web/20180123130350/http://rfduino.com/package_rfduino166_index.json but it doesn't work for BM installation due to missing files that were on rfduino.com. There is also https://github.com/OpenBCI/OpenBCI_RFduino.
RiddleAndCode AVR Boards RiddleAndCode avr https://github.com/RiddleAndCode/RnCAtmega256RFR2/ https://raw.githubusercontent.com/RiddleAndCode/RnCAtmega256RFR2/master/Board_Manager/package_rnc_index.json Package is only in archive file.
RIG RIG avr http://rig.reka.com.my/package_rig_index.json
RobotCing RobotCing avr https://github.com/RobotCing/Cing https://raw.githubusercontent.com/RobotCing/Cing/master/Software/Packages/package_RobotCing_index.json Package is only in archive file.
Rokit Arduino Box Libraries Rokit avr https://github.com/cheon7886/ArduinoBox / master 1.0 hardware package format
RTL871x ARM (32-bits) Boards development rtl87xx https://github.com/pvvx/RtlDuino /development/rtl87xx/ master
SAM15x15 SAM15x15 samd https://github.com/avandalen/SAM15x15 https://raw.githubusercontent.com/avandalen/SAM15x15/master/package_avdweb_nl_index.json Package is only in archive file.
Sanguino Sanguino avr https://github.com/Lauszus/Sanguino https://raw.githubusercontent.com/Lauszus/Sanguino/master/package_lauszus_sanguino_index.json / master
Scanner Pro MK3 Scanner Pro avr https://github.com/oschwartz10612/Scanner-Pro-MK3 https://raw.githubusercontent.com/oschwartz10612/Scanner-Pro-MK3/master/package_scannerpro_index.json /arduino_board/scanner-pro/ master
Sduino STM8 plain C core (non-C++) sduino stm8 https://github.com/tenbaht/sduino https://github.com/tenbaht/sduino/raw/master/package_sduino_stm8_index.json /sduino/stm8/ master
Seeed i.MX RT (NXP 32-bits ARM Cortex-M7) Boards Seeeduino imxrt https://github.com/Seeed-Studio/ArduinoCore-imxrt https://raw.githubusercontent.com/Seeed-Studio/Seeed_Platform/master/package_seeeduino_boards_index.json / master
Seeed SAMD Boards Seeeduino samd https://github.com/Seeed-Studio/ArduinoCore-samd https://raw.githubusercontent.com/Seeed-Studio/Seeed_Platform/master/package_seeeduino_boards_index.json / master
Seeed STM32F4 Boards Seeeduino Seeed_STM32F4 https://github.com/Seeed-Studio/stm32f4ArduinoCore https://raw.githubusercontent.com/Seeed-Studio/Seeed_Platform/master/package_seeeduino_boards_index.json / master
Seeeduino AVR Seeeduino avr https://github.com/Seeed-Studio/Seeeduino-Boards https://raw.githubusercontent.com/Seeed-Studio/Seeed_Platform/master/package_seeeduino_boards_index.json Package is only in archive file
Sense/Stage MiniBee Arduino files minibee avr https://github.com/sensestage/ssdn_minibee / master
SiFive Freedom Boards sifive riscv https://github.com/sifive/cinco http://static.dev.sifive.com/bsp/arduino/package_sifive_index.json /hardware/freedom_e/ master The toolchain is only provided for Linux and macOS. There is a fork that provides Windows support: https://github.com/westerndigitalcorporation/CincoWinPkg
Simba Simba avr https://github.com/eerimoq/simba-releases https://raw.githubusercontent.com/eerimoq/simba-releases/master/arduino/avr/package_simba_avr_index.json Package is only in archive file.
Simba Simba esp https://github.com/eerimoq/simba-releases https://raw.githubusercontent.com/eerimoq/simba-releases/master/arduino/esp/package_simba_esp_index.json
Simba Simba esp32 https://github.com/eerimoq/simba-releases https://raw.githubusercontent.com/eerimoq/simba-releases/master/arduino/esp32/package_simba_esp32_index.json
Simba Simba sam https://github.com/eerimoq/simba-releases https://raw.githubusercontent.com/eerimoq/simba-releases/master/arduino/sam/package_simba_sam_index.json
SODAQ AVR Boards SODAQ avr https://github.com/SodaqMoja/SodaqCore-avr http://downloads.sodaq.net/package_sodaq_index.json / master
SODAQ SAMD Boards SODAQ samd https://github.com/SodaqMoja/SodaqCore-samd http://downloads.sodaq.net/package_sodaq_samd_index.json / v1.6.15-sodaq The use of a separate branch for each release will make Branch outdated on every release
SparkFun Apollo3 Boards SparkFun apollo3 https://github.com/sparkfun/Arduino_Apollo3 https://raw.githubusercontent.com/sparkfun/Arduino_Boards/master/IDE_Board_Manager/package_sparkfun_index.json / master
SparkFun AVR Boards SparkFun avr https://github.com/sparkfun/Arduino_Boards https://raw.githubusercontent.com/sparkfun/Arduino_Boards/master/IDE_Board_Manager/package_sparkfun_index.json /sparkfun/avr/ master
SparkFun SAMD Boards SparkFun samd https://github.com/sparkfun/Arduino_Boards https://raw.githubusercontent.com/sparkfun/Arduino_Boards/master/IDE_Board_Manager/package_sparkfun_index.json /sparkfun/samd/ master
Spresense Reference Board SPRESENSE spresense https://github.com/sonydevworld/spresense-arduino-compatible https://github.com/sonydevworld/spresense-arduino-compatible/releases/download/generic/package_spresense_index.json /Arduino15/packages/SPRESENSE/hardware/spresense/1.0.0/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release.
STM32 Cores STM32 stm32 https://github.com/stm32duino/Arduino_Core_STM32 https://raw.githubusercontent.com/stm32duino/BoardManagerFiles/master/STM32/package_stm_index.json / master
STM32F1 Boards (STM32duino.com) Arduino_STM32 STM32F1 https://github.com/rogerclarkmelbourne/Arduino_STM32 /STM32F1/ master
STM32F4 Boards (STM32duino.com) Arduino_STM32 STM32F4 https://github.com/rogerclarkmelbourne/Arduino_STM32 /STM32F4/ master
STM32GENERIC for STM32 boards STM32 https://github.com/ChrisMicro/STM32GENERIC /STM32/ master Fork of https://github.com/danieleff/STM32GENERIC
STM32GENERIC for STM32 boards STM32 https://github.com/danieleff/STM32GENERIC /STM32/ master
STM8 Cores STM8 stm8 https://github.com/stm32duino/Arduino_Core_STM8 https://github.com/stm32duino/BoardManagerFiles/raw/master/STM8/package_stm8_index.json / master
Talk2 AVR Boards Talk2 avr https://bitbucket.org/talk2/arduino-ide-boards http://talk2arduino.wisen.com.au/master/package_talk2.wisen.com_index.json /talk2-avr/ master
tinkerkit_core tinkerkit avr https://github.com/TinkerKit/tinkerkit_core /tinkerkit/avr/ master
TinyCore Boards TinyCore avr https://github.com/xukangmin/TinyCore https://raw.githubusercontent.com/xukangmin/TinyCore/master/avr/package/package_tinycore_index.json /avr/ master
TL7788 Boards TL7788 arm https://github.com/hunianhang/tl7788_arduino https://rawgit.com/hunianhang/nufront_arduino_json/master/package_tl7788_index.json / master
Tlera Corp STM32L0 Boards TleraCorp stm32l0 https://github.com/GrumpyOldPizza/ArduinoCore-stm32l0 https://grumpyoldpizza.github.io/ArduinoCore-stm32l0/package_stm32l0_boards_index.json / master
Tomu EFM32 (32-bits ARM Cortex-M0+) Boards todbot ArduinoCore-EFM32 https://github.com/todbot/ArduinoCore-EFM32 / master
UDOO NEO (iMX6 SoloX) UDOO solox https://github.com/UDOOboard/arduino-board-package https://udooboard.github.io/arduino-board-package/package_udoo_index.json /udoo/solox/ boardmanager
UDOO QUAD/DUAL (Arduino Due) UDOO sam https://github.com/UDOOboard/arduino-board-package https://udooboard.github.io/arduino-board-package/package_udoo_index.json /udoo/sam/ boardmanager
w600 w600 w600 https://github.com/w600/arduino http://arduino.w600.fun/package_w600_index.json / master Winner Micro W60x
Watterott AVR Boards (dependency: Arduino AVR Boards) watterott avr https://github.com/watterott/Arduino-Boards https://github.com/watterott/Arduino-Boards/raw/master/package_watterott_index.json /watterott/avr/ master
Watterott SAMD Boards (dependency: Arduino SAMD Boards) watterott samd https://github.com/watterott/Arduino-Boards https://github.com/watterott/Arduino-Boards/raw/master/package_watterott_index.json /watterott/samd/ master
WAVGAT WAV8F AVR https://github.com/WAVGAT-SZ/WAVGAT Package is only in archive file.
WAVGAT AVR Boards WAV avr https://github.com/ericvb/Arduino-WavGat-Drivers /update/hardware/WAV/avr/ master
WebUSB WebUSB avr https://github.com/kimio-kosaka/webUSB-arduino https://kimio-kosaka.github.io/webUSB-arduino/package_webUSB_index.json / master
WeMos OU Boards avr https://github.com/wemos/OU /avr/ master
WEMOS XI LGT Boards wemos XI https://github.com/wemos/Arduino_XI / master
WiFi Duck AVR Boards wifiduck avr https://github.com/spacehuhn/hardware https://raw.githubusercontent.com/spacehuhn/hardware/master/wifiduck/package_wifiduck_index.json /wifiduck/avr/ master
WiFi Duck ESP8266 Boards wifiduck esp8266 https://github.com/spacehuhn/hardware https://raw.githubusercontent.com/spacehuhn/hardware/master/wifiduck/package_wifiduck_index.json /wifiduck/esp8266/ master
WiFi Duck SAMD Boards wifiduck samd https://github.com/spacehuhn/hardware https://raw.githubusercontent.com/spacehuhn/hardware/master/wifiduck/package_wifiduck_index.json /wifiduck/samd/ master
WildFire-Arduino-Core WickedDevice avr https://github.com/WickedDevice/WildFire-Arduino-Core /WickedDevice/ master
Windows 10 Iot Core Microsoft win10 https://github.com/ms-iot/iot-utilities https://github.com/ms-iot/iot-utilities/raw/master/IotCoreAppDeployment/ArduinoIde/package_iotcore_ide-1.6.6_index.json /IotCoreAppDeployment/ArduinoIde/1.1.2/ master The use of a version number in the folder name will make Repository Data Folder outdated on every release. The package is also listed in https://downloads.arduino.cc/packages/package_index.json
wirino wirino avr https://github.com/per1234/wirino https://per1234.github.io/wirino/package_per1234_wirino_index.json /avr/ master
Xmegaduino Boards arduino xmega https://github.com/Xmegaduino/Xmegaduino /hardware/arduino/xmega/ xmegaduino Their approach was to fork the IDE and add ATxmega support files to it.
XMegaForArduino XMEGA Boards XMegaForArduino avr https://github.com/XMegaForArduino/arduino https://github.com/XMegaForArduino/IDE/raw/master/package_XMegaForArduino_index.json / master The libraries are in a separate repo: https://github.com/XMegaForArduino/libraries
zoubworld SAM M0+ Boards - Beta build zoubworld_Arduino samd https://github.com/zoubata/ArduinoCore-samd http://zoubworld.com/~zoubworld_Arduino/files/Release/package_Zoubworld_index.json / master The JSON file wouldn't load 2019-06-27. A possible alternative is https://raw.githubusercontent.com/zoubata/Arduino15/master/package_Zoubworld_index.json
zuno_toolchain Z-Uno zw8051 https://github.com/Z-Wave-Me/Z-Uno-Core http://z-uno.z-wave.me/files/z-uno/package_z-wave.me_index.json /hardware/arduino/zuno/ master
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