Plasticity : Extract entities, relationships, and context from text using the Sapien Language Engine. This general natural language understanding API is used for t...
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.
DERI Pipes : Inspired by Yahoo's Pipes, DERI Pipes is an engine and graphical environment for general Web Data transformations and Mashup.
Mockoon : Mockoon is the easiest and quickest way to design and run mock APIs. No remote deployment, no account required, free and open-source.
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.