Communifire - Enterprise Social Collaboration Software
Ramaze - Ramaze is a very simple and straight-forward web-framework.
Workplace by Facebook - Connect everyone in your company and turn ideas into action.
Cuba - Cuba is a Ruby microframework for web development.
DigitalChalk - Online Training Software and Learning Management System (LMS)
Scorched - Scorched is a generic, unopinionated, DRY, light-weight web framework for Ruby.