API Workbench, a rich, full-featured integrated development environment (IDE) for designing, building, testing, documenting and sharing RESTful HTTP APIs. It supports both RAML 0.8 and the recently launched RAML 1.0. RAML makes it easy to manage the whole API lifecycle from design to sharing.
apm install api-workbench
Alternatively, open Settings/Preferences -> Install and search for api-workbench.
The main API Workbench site: www.apiworkbench.com
Please file API Workbench issues in the issues area
Additional information such as tips on installation may be found in the wiki