Here are a few freebies available now..in no particular order
Welcome to the home page of Anim8or. Anim8or is a 3D modeling and character animation program that I have written over the past couple of years, not as a commercial endeavor, but because I love 3D graphics, animation, and programming. While it is far from a complete professional level application like 3DStudio MAX or Lightwave, I believe that it has enough capability to be of use to others.
Blender is the open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback. Available for all major operating systems under the GNU Public License.
MilkShape 3D is a low-polygon modeler, which was initially designed for Half-Life. During the development, many file formats have been added.
MilkShape 3D has all basic operations like select, move, rotate, scale, extrude, turn edge, subdivide, just to mention a few. MilkShape 3D also allows low-level editing with the vertex and face tool. Primitives like spheres, boxes and cylinders are also available.
MilkShape 3D has also skeletal animation capabilities. This allows to export to morph target animation like the ones in the Quake model formats or to export to skeletal animations like Half-Life or Genesis3d
The Persistence of Vision Raytracer is a high-quality, totally free tool for creating stunning three-dimensional graphics. It is available in official versions for Windows, Mac OS/Mac OS X and i86 Linux. The source code is available for those wanting to do their own ports.
Terragen is a scenery generator, created with the goal of generating photorealistic landscape images and animations. It is available for Windows and the Mac OS. At this stage in its development, Terragen is free for personal, noncommercial use.
Although Terragen is a continually evolving work-in-progress, it is already capable of near-photorealistic results for professional landscape visualisation, special effects, art and recreation. Terragen has been used in a variety of commercial applications including film, television and music videos, games and multimedia, books, magazines and print advertisements
Feel free to add any of your favorites.. i know there are loads more out there