Pandemonium-Polestar is a project mainly written in C++ and C, it's free.
Applied Computing Project
List of Bugs: Cockroach Ant silverfish mosquitos Pressing two directions while against a wall will cause "wall humping"(Resolved: 5/11/11) FOPS occasionally land on the "wrong" side of a wall. Pressing two directions while against a FOP will cause "FOP humping"