RESTful API Modeling Language (RAML) is a concise, expressive language for describing RESTful APIs. RAML is built on broadly used standards such as YAML and JSON and is a non-proprietary, vendor-neutral open spec.
A reference implementation of a RAML parser for Java. It's based on SnakeYAML, and written in Java. It can be added as a Java library into a project directly or through Apache Maven. It is compliant with RAML 0.8, and provided under an Apache 2.0 license.
API Designer is a web-based API development tool that allows API providers to design their API quickly, efficiently, and consistently, and socialize the design. It consists of a RAML editor side-by-side with an embedded RAML console (the API Console). It is provided under the open-source CPAL license.
API Console is a graphical user interface for a RAML-defined API that visually exposes the API’s structure and important patterns and serves as interactive API documentation. It is provided under the open-source CPAL license.
APIkit is a declarative toolkit that leverages RAML to facilitate the implementation of APIs. It uses RAML as the definition of the API, which can then be used with APIkit Maven- and Mule Studio-based tools for mocking the interface and implementing its backend using Mule flows. It is provided under the open-source CPAL license.
SoapUI is a very popular functional testing tool, broadly used for testing APIs. It supports not only SOAP but also REST and any other HTTP APIs, as well as JMS, AMF and JDBC. The RAML plugin for SoapUI allows importing RAML descriptions of APIs into SoapUI to test those APIs. The plugin is provided under the open-source Apache 2.0 license.
RAML Store provides a simple storage API plus a persistence plugin which enables you to run the RAML API Designer locally (rather than using a cloud service) and still be able to manage and collaborate on your design. The service is built with node.js, using express and mongodb.