A big list of APIs (spent like 8 hours just trying to index what's available)

apis.txt

Google apps
  https://developers.google.com/google-apps/products
    Maps
    Calendar
    Gmail
    Spreadsheets
    Tasks (TODO list?)
    Drive (like s3?)
    Forms (like a generalized survey?)
    Hangouts
    Slides (Powerpoint?)
  http://www.computersciencezone.org/50-most-useful-apis-for-developers/
    Geocoding
    Translate
    Youtube
    Analytics
    Blogger
    Ads
Natural Language Processing
  http://developer.ibm.com/watson
  http://www.programmableweb.com/category/natural-language-processing
  Maybe for sentiment analysis?
  Whether a topic is trending?
  Needle in a haystack: Find the parts of an audio stream where they talk about something relevant
Twittah
S3
Twilio
  SMS
  Voice
  Video (looks super easy: https://github.com/TwilioDevEd/video-quickstart-ruby IDK how you'd test it)
  IP Messaging (uhm... websockets?)
  TaskRouter "distributing tasks such as phone calls, leads, support tickets, and other work items to the people and processes that can best handle them"
Email
  (mailchimp, sendgrid)
Slack
Flickr
Tumblr (blogs, apparently)
IFTTT
  https://ifttt.com
Weather
  https://developer.yahoo.com/weather/
Yahoo
  https://developer.yahoo.com/everything.html
Meetup
  http://www.meetup.com/meetup_api/
DataMuse
  http://www.datamuse.com/api/
  similar meaning
  related to
  ending with
  starting with
  spelled similarly to
  that rhyme with
  + tons of other brilliant constraints!
Yahoo Smart TV
  https://yahoosmarttv.tumblr.com
  Uhm, somehow you can generate television content
Ebay
3 taps
  https://3taps.com/developers-overview.php
  seems to wrap a bunch of sites you can buy stuff from
Census
  http://www.census.gov/data/developers/data-sets.html
Soundcloud
  http://developers.soundcloud.com/
  upload / share sounds (can you search / download?)
Bit.ly
  http://dev.bitly.com/
  shorten urls
Weather
  several here http://www.computersciencezone.org/50-most-useful-apis-for-developers/
Vimeo
  http://developer.vimeo.com/
Yelp
  Reviews
  Locations
Owler
  https://developers.owler.com/docs
  search company info
  search competitor info
  search feeds
Sticky
  http://www.programmableweb.com/api/sticky
  Somehow (algorithm or recording data?) creates a heatmap of what users look at when they go to a webpage
QuantConnect
  http://www.programmableweb.com/api/quantconnect
  Test algorithm against historical financial data
Handwriting Recognition
  http://www.programmableweb.com/api/myscript-cloud-recognition
Image Color Extraction
  http://www.programmableweb.com/api/image-color-extraction
Glot
  http://www.programmableweb.com/api/glot-snippets
  pastebin with runnable snippets
  HTTP API for running code inside docker containers and for storing and managing snippets
Hotel pricing / rate data
  http://www.programmableweb.com/api/monitorhotels-rate-shopping-data
Sentiment Analysis
  http://www.programmableweb.com/api/twinword-sentiment-analysis
Image Recognition
  http://www.programmableweb.com/api/eyespy
  http://www.programmableweb.com/category/recognition
Extract "aboutness" from unstructured text
  http://www.programmableweb.com/api/thomson-reuters-open-calais
Group related text
  http://www.programmableweb.com/api/rxnlp-cluster-sentences-and-short-texts
  eg sentences, tweets, headlines, etc
Cloud jobs API
  http://www.programmableweb.com/api/google-cloud-jobs
Tensor Flow (?)
  http://www.programmableweb.com/api/google-cloud-machine-learning
  Desc made it sound like you could run tensor flow on their machines via an api
Linda
  Answers questions http://www.programmableweb.com/mashup/linda
Rubygems
  http://guides.rubygems.org/rubygems-org-api/
Github
Event Date information
  http://www.programmableweb.com/api/predicthq
  eg holidays
Contact Info
  http://www.programmableweb.com/api/pipl
  Get more info about a person
DRM (protecting your IP)
  http://www.programmableweb.com/mashup/protect.ly
Deck of cards
  http://www.programmableweb.com/api/deck-cards
  pretty much what it sounds like
  you could make a game w/ it or smth
BetterDoctor
  http://www.programmableweb.com/api/betterdoctor
  Doctor location / ratings / photos / contact info / insurance info
Terracycle
  Recycling difficult material http://www.programmableweb.com/api/terracycle
BodyKit
  http://www.programmableweb.com/news/body-labs-bodykit-api-captures-human-body/2015/03/09
  Creates 3d models of people's bodies from images / videos
Informedica
  http://www.programmableweb.com/api/infermedica
  Anonymous medical diagnoses
Stripe
  Accept payments
Small Business API
  http://www.smallbusinessapi.com/?ref=producthunt
  Find a business for w/e (they can pick one for you let businesses bid on w/e)
  eg could be useful for an administrator needing to find a caterer
New York Times
  http://developer.nytimes.com
  articles
  book/movie reviews
  comments
  metadata
Face Detection
  https://market.mashape.com/faceplusplus/faceplusplus-face-detection
Song lyrics
  https://market.mashape.com/musixmatch-com/musixmatch
Crime Data
  https://market.mashape.com/jgentes/crime-data
Recipe API
  https://market.mashape.com/spoonacular/recipe-food-nutrition
Profanity word check
  http://killerapi.blogspot.sg/2011/09/profanity-word-check-api.html
Convert math formulas to images
  https://market.mashape.com/orthosie/equa-images
ASCII Art from text
  http://textart.io/figlet#
  Kinda dumb, it costs money, but there's a gem that does this for free and w/o an HTTP request (artii)
IFTTT list
  https://ifttt.com/search/services
  a lot of IOT integration in there, but there's more general stuff, too, as well as categorized services you can integrate with
Wolfram
  IIRC from his StrangeLoop video, the wolfram language was impressively badass and had tons of integrations
  probably quite a few are available via wolfram alpha (total guess)
Sharpr
  https://ifttt.com/sharpr
  a knowledge hub (I'm reading it like the blackboard in the Pragmatic Programmer)
Wikipedia
  IIRC, its API is terrible (b/c its data is barely structured)
Print photographs
  https://ifttt.com/printhug
  ie actual physical photographs, like at Walgreens
Easily get photos from your phone to wherever
  https://ifttt.com/do_camera
DailyMotion
  https://ifttt.com/dailymotion
  video hosting
Photograph marketplace
  https://ifttt.com/500px
Giphy
  https://ifttt.com/giphy
  find gifs about things (presumably animated)
Package Tracking
  https://ifttt.com/boxoh
Price Tracking
  https://ifttt.com/semantics3
Classifieds
  https://ifttt.com/craigslist
  "jobs, housing, personals, for sale, services, community, gigs, resumes, and discussion forums"
Slice
  https://ifttt.com/slice
  "keep track of everything you buy online"
Social networks
  reddit, twitter, linked in, pinterest, facebook, ello, foursquare, instagram, etc
  https://www.reddit.com/dev/api
Surveys
  https://ifttt.com/surveymonkey
Ticatag
  https://www.ticatag.com
  it's like... a button you attach to physical devices so you don't lose them, and when you press the button, it emits an event you can hook into
XY Findable
  https://www.xyfindables.com
  seems to also be a physical thing you attach to shit you don't want to lose (do you have to recharge the batteries, or does it interact with an externally generated signal? why don't these sites start with an explanation of what their thing is?)
Location based events
  http://signul.io
  (best I could make of it w/ 15s glance around the page)
All NASA Data
  https://data.nasa.gov/developer
  apparently all of NASA's data has an API <3
  it's not just space stuff either, there's a lot of geological and earth science data, eg landslides, temperature, etc
AWS public data sets
  https://aws.amazon.com/public-datasets/
  "moderate-resolution satellite imagery of all land on Earth"
  "commercial satellite imagery and labeled training data" (https://mapzen.com/documentation/terrain-tiles/ I think)
  "global dataset providing basemap elevation coverage"
  ...
  genomic data (sequences, epigenetics, etc)... why do you always have to be a "qualified researcher"? :(
  "A detailed map of human genetic variation"
  multimedia commons "100M images and videos with audio and visual features and annotations"
  "Google Books n-gram corpuses"
  3000 rice genome sequences
  more here: https://aws.amazon.com/datasets/
    human microbiome
    enron emails
    MSDSs
    1 million songs (audio features and metadata for 1 million contemporary popular music tracks)
    50,000ish newsgroup archives
    wikipedia data
    ...and more...
Kandy
  https://developer.kandy.io
  a competitor to Twilio?
FOAAS
  http://www.foaas.com
  Could be useful
Beer
  http://www.brewerydb.com/browse
Place Names
  http://www.geonames.org
Download the internet
  http://commoncrawl.org
  https://aws.amazon.com/public-data-sets/common-crawl/
Various games
  Steam, Battle.net I forgot the other one, RIOT or smth
TV Database
  http://thetvdb.com/wiki/index.php?title=Programmers_API
Bitcoin Gambling
  https://www.moneypot.com/api-docs
Turn anything into an API
  https://firebase.google.com/docs/
  I think... then again, Wikipedia says "mobile and web application platform", whatever that means
IP geolocation
  https://freegeoip.net/?q=195.144.39.218
Officer involved killings
  https://thecountedapi.com
  SNAFU
USDA food composition databases
  https://ndb.nal.usda.gov/ndb/api/doc
More nutrition stuff
  https://www.nutritionix.com/business/api
Curated data sets (AFAICT)
  http://geodesystems.com/repository/search/textform?show_providers=true
Wolfram Alpha
  http://www.wolframalpha.com
  http://products.wolframalpha.com/api/documentation.html
  they apparently have an API that emits XML
  you seem to be able to get practically anything off this O.o
  like I typed "notes on a piano" and it gave me a ton of info, and had a little play button
  the play button sounded terrible, so I tried "piano timbre" and it didn't give me what I
  was hoping for (a waveform / math equation / piano samples) but it did give me a biography
  of everything you could ever want to know about the word "timbre"
  also, if I had the pro version, I could probably download what I was looking for
Freebase
  sounds like user-contributed well structured ontologies o.O https://en.wikipedia.org/wiki/Freebase
  it's shut down now, but I think google and AWS are continuing to maintain the data
  https://developers.google.com/knowledge-graph/
Dictionary
  http://definr.com/definr/show/shoes
Mac Address lookup / search
  http://www.coffer.com/mac_find/
Look up location information based on zip code
  http://api.zippopotam.us/us/90210
Movie information
  https://www.themoviedb.org/
Music information
  http://freemusicarchive.org/api
Country information
  http://restcountries.eu/
Convert between formats (just the list of formats is fascinating)
  https://cloudconvert.com/formats#website
More Weather
  http://openweathermap.org/api
More contact info
  https://www.fullcontact.com/developer/
City info, apparently
  http://wiki.open311.org/GeoReport_v2/
  http://phlapi.com/open311.html
Government APIs
  https://www.data.gov/developers/apis
  http://catalog.data.gov/dataset?q=-aapi+api+OR++res_format%3Aapi#topic=developers_navigation
  Whenever I've tried to look at this data, it's not seemed useful, though
AWS
  https://aws.amazon.com
  lots of ops stuff (databases, storage, machines, routing, etc)
  some machine learning stuff (text to speech)
  email
  game dev (seems out of place)
  "stream desktop applications to a browser" (AppStream) ...interesting
  media transcoding
Unsplash-it
  Get images of arbitrary size
    Height of 200, width of 300        https://unsplash.it/200/300
    Randomize that image               https://unsplash.it/200/300?random
    Grayscale (timed out when I tried) https://unsplash.it/g/200/300
    List of images                     https://unsplash.it/list
    Request specific image             https://unsplash.it/200/300?image=0
    Blurred image                      https://unsplash.it/200/300/?blur
    Crop gravity                       https://unsplash.it/200/300/?gravity=south
      values: north, east, south, west, center
Spotify
  They have a crappy web API (you can't, eg, command the app)
  You can get the functionality for a remote control by using the AppleScript API,
  That does mean you have to be on the same computer as Spotify, and it needs to be
  a Mac. I posted a bunch of examples and a link to a client here https://github.com/spotify/web-api/issues/15#issuecomment-205142633