GatherBird Open Source
CowBird allows you to create OpenGL windows and controls in .NET Windows and Linux applications.
Download CowBird source and executables
If you would like to contribute (or report any problems) email Ben Fields at cowbird@gatherbird.com
Version 0.4 released December 7th, 2011 under the LGPL license.
link
CowBird Programmers Guide PDF