Kurisu OS 3.0
Monsta FTP is a delightfully intuitive web-based file manager.
PXell - Online project management.
Contao Open Source CMS (fka TYPOlight)
Simple counter for Windows Explorer
Web-based HTML5 Photo Viewer
Jewish prayer times
Best media player that will play all format files
Proofreading Software for 20+ Languages
The leading Open Source survey tool
Notepad++ project is moving to GitHub:
OXID eShop is a trusted and flexible open source e-commerce system
An OpenSource (C# .NET) TeamPlay Environment.
OtrosVfsBrowser download page
Simple, modern, lightweight and open-source password manager