six-irc is a simple IRC client. It's inspired by sic (from suckless.org), but is more usable and even smaller.
msnake is a simple console-based snake game written in C. There are 3 different fruits with 3 different effects. There is also a high score system.
A program that monitors the state of mirrors.
A modern, highly-concurrent, cross-platform 3D video game engine.