Some of the free APIs which any developer can use in his /her project:
Communication APIs
➔ Twillio
➔ Yo
➔ SendGrid
➔ Moxtra
ML APIs
➔ Tensorflow
➔ IBM Watson
➔ MonkeyLearn
➔ APIai
Social APIs
➔ Facebook
➔ Twitter
➔ Reddit
➔ Instagram
➔ Google+
Geo APIs
➔ NASA
➔ Yelp
➔ Google Maps
➔ Google Places
➔ Google Earth
➔ Mapbox
Music APIs
➔ Spotify
➔ Echo Nest
➔ Sound Cloud
➔ Google play
iTunes
Payment APIs
➔ Paypal
➔ Google Pay
➔ PayU
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Top comments (1)
Hi, you have here a much more complete list and with links to API github.com/public-apis/public-apis