Really depends exactly what you want to accomplish. How complex is your scene? What sort of render quality are you after? Do you need real-time animation, or are rendered stills good enough?
First-rate, full game engines (have been used for commercial games)
- Panda3d http://www.panda3d.org/
- PyOgre http://www.ogre3d.org/tikiwiki/PyOgre
- Pyrr (Irrlicht wrapper)
Less popular 3d engines, new or beta: YMMV.
- OpenSceneGraph http://www.openscenegraph.org/projects/osg
- Spyre http://pduel.sourceforge.net/spyre/spyre.spyre-module.html
- PySoy http://www.pysoy.org/
- Soya http://pypi.python.org/pypi/Soya/0.11.2
- PyCrystal http://www.crystalspace3d.org/main/PyCrystal
- Horde3d http://www.horde3d.org/
- VTK (Visualization Tool Kit) http://www.vtk.org/
Low-level OpenGL interfaces – more control, more for you to do yourself
- PyOpenGL http://pyopengl.sourceforge.net/
- Pyglet http://www.pyglet.org/
- Zoe http://www.alcyone.com/software/zoe/
Non-realtime interfaces
- cgkit http://cgkit.sourceforge.net/documentation.html (Renderman, Maya)
- Blender http://www.blender3d.org/
- POVray wrapper http://code.activestate.com/recipes/205451/