projectM is an iterative music visualization library which uses OpenGL for hardware acceleration. It is compatible with Milkdrop presets.

Datovka is a rich desktop client to access messages stored in the Czech Data Boxes system (databox)

QJoyPad takes input from a gamepad or joystick and translates it into key strokes or mouse actions, letting you control any X-Windows program with your game controller. This lets you play all those games that for some reason don't have joystick support with your joystick.

WarMUX is a free game in the genre of "turn-based artillery games" like Scorched Earth or Worms. Several players can play together, either locally or over the network. It is also possible to compete against computer-driven teams. The teams are styled after the mascots of various free software projects.

Matplotlib is a pure Python plotting library designed to bring publication quality plotting to Python with a syntax familiar to Matlab users. All of the plotting commands in the pylab interface can be accessed either via a functional interface familiar to Matlab users or an object oriented interface familiar to Python users.