Blender is a powerful solid-as-a-rock versatile 3D suite for animation, modeling, rendering, interactive creation, post-production, featuring a filled-with-controls interface, import / export support for popular file formats (like for example, Wavefront Obj and 3D Studio), etc.
Weeks ago, Blender 2.66 was released, introducing a series of useful features, improvements and enhancements, including cycles hair rendering, vertex bevel tool, mesh cache modifier, etc.