The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.
API List - A collective list of APIs. Build something.
PublicAPIs - Explore the largest API directory in the galaxy
Spinneret - Record and Automate Anything on the Web
Mocklets - A HTTP-based API simulator to assist parallel development 🛠️
Airbnbmag - Human stories from around the globe