C#... huh :)

Accord.Net - http://www.viva64.com/en/b/0410/

Microsoft WPF Examples - http://www.viva64.com/en/b/0407/

Xamarin.Forms - http://www.viva64.com/en/b/0400/

Lucene.Net - http://www.viva64.com/en/b/0381/

Xenko Game Engine - http://www.viva64.com/en/b/0379/

Space Engineers - http://www.viva64.com/en/b/0376/

WPF examples by the Infragistics Company - http://www.viva64.com/en/b/0375/

CNTK tool kit - http://www.viva64.com/en/b/0372/

Sony C#/.NET component - http://www.viva64.com/en/b/0371/

IronPython and IronRuby - http://www.viva64.com/en/b/0367/

MonoDevelop - http://www.viva64.com/en/b/0366/

CoreFX - http://www.viva64.com/en/b/0365/

Roslyn - http://www.viva64.com/en/b/0363/