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