"logan" is a Ruby gem constructed to interact with the Basecamp API. Currently on version 0.1.1 at the time of this submission, the gem appears to be well supported and documented, compatible with the new Basecamp API. Though not officially built by Basecamp's provider, 37Signals, "logan" is fully endorsed by Basecamp on their GitHub channel and developer site.
Redbooth, a leading collaboration and communication platform provider, has just announced the launch of the company's first public API along with a new self-service portal for developers. The brand new Redbooth API makes it possible for developers to create innovative web, mobile, and desktop applications driven by the Redbooth platform as well as integrate Redbooth features and functionality into existing systems.