Torque 3D is open source. There is a repo for folks wanting to develop it more, such as for porting to GNU/Linux. And of course a downloadable zip for those who want to make games.
This is interesting. Torque 3D has been an entry point for a lot of indie game developers, and now it will be available for a lot more folks. I imagine when the Liberated Pixel Cup gets to 3D it will have some amazing results!