I’ve played around in the open source 3D modelling software Blender a little bit. It may not be as fancy as the retail software on the market today, but if you compare it with versions of Maya or MAX from just a few years ago, it blows them out of the water.
A team of creative folks used the free software to make a short animated cartoon, Big Buck Bunny. They were funded by Blender foundation support and pre-orders of the DVD by the Blender community.
It’s licensed under the Creative Commons Attribution 3.0, so it’s free to watch and distribute so long as the credits are attached. Theoretically you could even download the source files, remix the movie and then sell it for a profit. Here is the original movie via YouTube: