Linux apps that run anywhere. Download an application, make it executable, and run! No need to install. Distribute your desktop Linux application in the AppImage format and win users running all common Linux distributions. Package once and run everywhere. Reach users on all major desktop distributions. http://appimage.org/
Fotoxx is a free open source Linux program for image editing and collection management. The goal is to meet the needs of serious photographers while remaining fast and easy to use.
FreeOrion is a free, open source, turn-based space empire and galactic conquest (4X) computer game being designed and built by the FreeOrion project. FreeOrion is inspired by the tradition of the Master of Orion games, but is not a clone or remake of that series or any other game.
Fritzing is an open-source hardware initiative that makes electronics accessible as a creative material for anyone.
GNU PSPP is a program for statistical analysis of sampled data. It is a free as in freedom replacement for the proprietary program SPSS.
GammaRay is a tool to poke around in a Qt-application and also to manipulate the application to some extent.