The COLOURlovers Java SDK by Daniel Stoneburner wraps the API to access color categories that can be implemented into web services and mobile applications. JAR files and properties are available on the site.
Any company that makes an API knows that just having the API is not enough. A bare endpoint is probably worse than not having an API at all. To make your API and platform useful you need documentation, tools, examples and forums. If you are a successful API company you start developing a community of people that work with your service. The community shares ideas and helps each other out.