Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License.
- Its free and open source and very powerful.
- It's free and Open Source. It has equal or way better 3D features than Autodesk Maya on it's frequent updates.
- Mostly because it's free, but it is also a fully-functioning and constantly improving 3D package. Nearly everything you can do in Maya is possible in Blender.