Furball Engine is actually my Ludum Dare 19 game Frolicking furballs Safari Resort. It has fully commented source code and my intention is to provide a set of detachable tech that you can take out of the engine and include in your own game. It also can be used entirely to build your game upon it, if you are man enough to write your game in C.
Anyways, the engine is available for free commercial or whatever kind of use to anyone, and my intent is that it will come in handy during 7DFPS, so grab it, check it out, and use it!
Grab it now!