Blender is the first and only fully integrated 3D graphics creation suite allowing modeling, animation, rendering, post-production, realtime interactive 3D and game creation and playback with cross-platform compatibility - all in one tidy, easily and free downloadable package!
this software is open-source and licensed under GPL.
sources are available from the developer site.
Mac OS X 10.2
Mac OS X 10.3
Mac OS X 10.3.9
Mac OS X 10.4 PPC
||Mac OS X 10.2 or later. Mac OS X 10.2 package needs a separate python install for full scripting ability.