IronRuby implements Ruby in the .NET runtime VM, with excellent performance and seamless integration with .NET libraries and infrastructure. A fast, compliant Ruby powered by .NET.
IronRuby is a .NET implementation of the Ruby programming language. IronRuby heavily leverages Microsoft’s Dynamic Language Runtime, and both are released with full source code under the Microsoft Permissive License. The IronRuby source code is hosted on Rubyforge, which is a home for open source Ruby projects.