Located at http://www.castleproject.org/

On 2008-04-05, it says "Castle is an open source project for .net that aspires to simplify the development of enterprise and web applications. Offering a set of tools (working together or independently) and integration with others open source projects, Castle helps you get more done with less code and in less time."

Has anyone used Cobra on Castle? If so, tell us about it in the forums and/or here.