a free & lightweight CMS
DC client
Contao Open Source CMS (fka TYPOlight)
Simple counter for Windows Explorer
Make robots for MediaWiki-powered sites!
MyBB Social Network mod
Kurisu OS 3.0
The leading Open Source survey tool
Notepad++ project is moving to GitHub:
An OpenSource (C# .NET) TeamPlay Environment.
Coin collecting software for organize and manage your own catalogue
PXell - Online project management.
Pencil2D is a cross-platform animation/drawing application.