XMakemol is a mouse-based program, written using the LessTif widget set, for viewing and manipulating atomic and other chemical systems. It reads XYZ input and renders atoms, bonds and hydrogen bonds.

Samhain is an integrity checker and host intrusion detection system that can be used on single hosts as well as large, UNIX-based networks. It supports central monitoring as well as powerful (and new) stealth features to run undetected on memory using steganography.

Gravit is a free, visually stunning gravity simulator, where you can spend endless time experimenting with various configurations of simulated universes.

Screentest is a CRT and LCD screen testing utility. Ever wondered how good the quality (sharpness, linearity, convergence, etc.) of your CRT/LCD monitor is? Screentest displays the testing patterns which you can use to evaluate the quality of your monitor.