Wikipedia
CruiseControl.rb
In software development, CruiseControl.rb is a Ruby-based framework for a continuous build process. It allows one to perform a continuous integration of a codebase in any language and on any platform.
CruiseControl.rb is free, open-source software, distributed under the Apache 2.0 license. It was originally created by employees of ThoughtWorks as a lightweight continuous integration framework that was easier to install, use and extend than open source alternatives that existed at that point in time.
Publicly visible CruiseControl.rb instances include the one used to integrate its own codebase, as well the instance used by the Ruby on Rails project.