Hoppscotch : A free, online, open source API request builder
npoint.io : JSON storage bins with schema validation
OpenCalais : Calais is a rapidly growing toolkit of capabilities that allow you to readily incorporate state-of-the-art semantic functionality within your blog, co...
DuckRails : DuckRails is a development tool.
Its main purpose is to allow developers to quickly mock API endpoints that for many possible reasons can't reach at a...
Pipes : Pipes is a powerful composition tool to aggregate, manipulate, and mashup content from around the web.
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.