Vitetris is a terminal-based Tetris game. It can be played by one or two players, over the network or on the same keyboard.

The GNU plotting utilities include programs for plotting two-dimensional scientific data. They are built on top of GNU `libplot', a library for device-independent two-dimensional vector graphics.

Xprobe2 allows you to determine what operating system is running on a remote host. It sends several packets to a host and analyses the returned answers.

DFCGen, the Digital Filter Coefficients Generator, assists the engineer in the design of digital filters. It supports the engineer in analysis and synthesis of linear time-invariant time-discrete (LTI) systems from the theoretical point of view. It performs generation of system transfer function coefficients in the Z-domain, based on the type and specific parameters of a chosen system.