WireMock : Free and Open Source tool for building mock APIs. Create stable development environments, isolate yourself from flakey 3rd parties and simulate APIs t...
httpbin.org : A simple HTTP Request & Response Service.
Openframe : Openframe is an open source platform for artists, curators and art enthusiasts to share, discover and display digital art.
Openframe is free. Anyone c...
Public APIs : A collective list of free APIs for use in web development.
Bluepine is a DSL for defining API Schema/Endpoint with the capabilities to generate Open API (v3) spec, validate API request and serialize object for API response based on single schema definition.