Well, this page is a little ugly, but that will change as soon as I can
think of a good word that the G in the name should stand for. I guess either
General Physics, Game Physics, GNU Physics or something. Well, we'll see.
GPhysics right now is a simple game physics lib, which does some simple calculations to get you decent movement effects in any 2D game. 3D physics will be included eventually. This library is licensed under the GNU LGPL, so you can use it for pretty much anything you wish, as long as you follow the licensing terms(i.e. make source available, make sure I get source updates :)
GPhysics is in the developmental stage, but the simple game physics part works, for the most part. If you want to help the project out, have a patch to submit, or you just want to ask a question, then send me a message.
gphysics-0.20.1.tar.gz - Source code for Linux/Unix systems
gp0201.zip - Source code for DOS/Windows systems