Art of Illusion is a free, open source 3D modelling and rendering studio.
myStudio is a free/open source 3D Modelling, Rendering, Animation Studio & Movie Editor. myStudio was based on Art of Illusion project.
K-3D is a complete free-as-in-freedom 3D modeling, animation and rendering system.
Wings 3D is a open-source polygon mesh modeller inspired by Nendo from Nichimen/Izware.
Anim8tor Anim8or is a 3D modeling and character animation program.
Are there any others? If yes, post here links, please. THX:D:D