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Download Blender
Blender
By The Blender Foundation
Blender is a 3D modeler and animation program. Blender has many powerful features and is comparable to high-end commercial 3D software. Blender features support for polygon meshes, fast subdivision surface modeling, bezier curves and NURBS surfaces, metaballs, polygon sculpting, and vector fonts. Animation tools including inverse kinematics, skeletal and lattice deformation, shape keys, keyframes, timeline, non-linear animation, constraints, vertex weighting, soft body dynamics including mesh collision detection, fluid dynamics, hard body dynamics, particle based hair and a particle system with collision detection. It also features game making, toon rendering and much more.
Links
Blender news blog.
Comprehensive tutorial at Wikibooks.