- https://undraw.co : Open-source illustrations for every project you can imagine and create.
- https://www.autotracer.org/ : Converts your raster images to vector graphics.
- https://www.vectorizer.io : Convert raster images like PNGs, BMPs and JPEGs to scalable vector graphics (SVG).
- https://svg2vector.com/ : SVG to Vector Drawable.
- https://www.img-bak.in/ : Image baker is a tool to generate iOS and Android assets. You will get the optimized images in all sizes you need including xxhdpi, xhdpi, hdpi, mdpi, ldpi drawables.
- https://iconsvg.xyz/ : ICONSVG is a tool to simplify the process of finding and generating common icons for your project.
- http://www.jsonschema2pojo.org/ : Generate Plain Old Java Objects from JSON or JSON-Schema.
- http://shapes.softartstudio.com/ : Android Shapes Generator.
- https://romannurik.github.io/AndroidAssetStudio/ : Android Asset Studio.
- https://github.com/wasabeef/awesome-android-ui : A curated list of awesome Android UI/UX libraries.
- https://github.com/facebook/network-connection-class : Network Connection Class is an Android library that allows you to figure out the quality of the current user's internet connection.
- https://github.com/orhanobut/logger : Simple, pretty and powerful logger for android .
- https://github.com/Yalantis/uCrop : Image Cropping Library for Android.
- https://github.com/intuit/sdp : SDP - Scalable dp.
- https://github.com/intuit/ssp : SSP - Sacable sp.
- https://github.com/hdodenhof/CircleImageView : A circular ImageView for Android
- https://github.com/PhilJay/MPAndroidChart : A powerful rocket Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, dragging and animations.
- https://github.com/afollestad/material-dialogs : A beautiful, fluid, and extensible dialogs API for Kotlin & Android.
- https://github.com/Karumi/Dexter : Android library that simplifies the process of requesting permissions at runtime.
- https://github.com/Fondesa/KPermissions : A Kotlin library that helps to request runtime permissions in Android.
- https://github.com/greenrobot/EventBus : Event bus for Android and Java that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.
- https://github.com/javiersantos/AppUpdater : A library that checks for your apps' updates on Google Play, GitHub, Amazon, F-Droid or your own server.
- https://github.com/hani-momanii/SuperNova-Emoji : library to implement and render emojis For Android.
- https://github.com/leolin310148/ShortcutBadger : An Android library supports badge notification like iOS in Samsung, LG, Sony and HTC launchers.
- https://github.com/appwise-labs/NoInternetDialog : A beautiful Dialog which appears when you have lost your internet connection.