DTPSTree shows the running processes as a tree. It is a reimplementation of pstree from PSmisc for FreeBSD. It also works without /proc and will show the full set of processes in a jail even if init is not present.
procenv is a tool that dumps all attributes of its environment. It can be run as a test tool, to understand what environment a process runs in and for system comparison.
A Java program that implements the Sokoban game.
A 2D/3D MMORPG client.