Free Software-id

Blender, the open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback. Available for Windows, Linux, Irix, Sun Solaris, FreeBSD or Mac OS X. Blender has proven to be an extremely fast and versatile design instrument. The software has a personal touch, offering a unique approach to the world of Three Dimensions. Use Blender to create TV commercials, to make technical visualizations, business graphics, to do some morphing, or design user interfaces. You can easy build and manage complex environments. The renderer is versatile and extremely fast. All basic animation principles (curves & keys) are well implemented.
*** Modeling
A range of 3D object types including polygon meshes, NURBS surfaces, bezier and B-spline curves, metaballs, vector fonts (TrueType, PostScript, OpenType)
'Smooth proxy' style catmull-clark subdivision surfaces
Boolean mesh functions
Editing functions such as extrude, bevel, cut, spin, screw, warp, subdivide, noise, smooth Soft selection editing tools for organic modeling
Python scripting access for custom tools
*** Animation
Armature (skeleton) deformation with forward/inverse kinematics, auto skinning and interactive 3D paint for vertex weighting
Non-linear animation mixer with automated walkcycles along paths
Constraint system
Vertex key framing for morphing, with controlling sliders
Character animation pose editor
Animatable lattice deformation
'Ipo' system integrates both motion curve and traditional key-frame editing
Audio playback, mixing and editing support for sound synchronisation
Python scripting access for custom and procedural animation effects
*** Realtime 3D/game creation
Graphical editor for defining interactive behavior without programming
Collision detection and dynamics simulation
Python scripting API for sophisticated control and AI, fully defined advanced game logic
Supports all OpenGL?