I’ve created a Ruby wrapper for the Rainmaker API. Rainmaker is sponsoring a developer contest and I built this gem to assist coders interested in entering.
You can find it on RubyGems.org or on Github. My goals when creating this wrapper were to allow developers to use the API in an idiomatic way they were familiar with: accessing properties of an object rather than keys of a collection, using lowercases and underscores instead of camel casing; and to decouple the JSON/XML parsers and HTTP adapters. This was achieved using the excellent Faraday gem.
Feel free to make changes or file issues on Github, and happy coding!