Appsmith : Turn any datasource into an internal app in minutes. Appsmith lets you drag-and-drop UI components to build pages, connect to any API, database or Gra...
Bliss.js : Want to use Vanilla JS but find native APIs a bit unwieldy? Bliss is for you
pump.io : Social server with an ActivityStreams API. It's a stream server that does most of what people really want from a social network.
httpbin.org : A simple HTTP Request & Response Service.
apiato : apiato is a starter project, designed to help you build scalable API’s faster, by providing tools and functionalities that facilitates the 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.