Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Google Open Source - All of Googles open source projects under a single umbrella
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Code NASA - 253 NASA open source software projects
Autodesk Maya - Maya is 3D computer animation software with powerful modeling, rendering, simulation, texturing, and animation tools for artists, modelers, and animators.
Disney Open Source - Explore Disney's Open Source projects