Frisby.js : Frisby is a REST API testing framework built on node.js and Jasmine that makes
testing API endpoints easy, fast, and fun. Read below for a quick overv...
kimono : Turn websites into structured APIs from your browser in seconds
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.
htty : htty is a console application for interacting with web servers. It’s a fun way to explore web APIs and to learn the ins and outs of HTTP.
Bliss.js : Want to use Vanilla JS but find native APIs a bit unwieldy? Bliss is for you
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.