Blender
Free 3D creation suite with powerful rendering
Blender is a remarkably capable 3D production program for Windows, covering far more than basic modeling. It is free and open-source, yet it includes tools for modeling, sculpting, texturing, animation, rendering, motion tracking, compositing, video editing, and even interactive game-style projects.
The main appeal is that Blender lets you handle a full 3D workflow in one place.