The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.
Mocklets - A HTTP-based API simulator to assist parallel development 🛠️
PublicAPIs - Explore the largest API directory in the galaxy
API List - A collective list of APIs. Build something.
Yappes - Build, manage and distribute your APIs in one place 🛠️
Phantombuster - A marketplace of simple to use no-code APIs