Big Buck Bunny
For me, I think this is quite an inspirational post. People often doubt the prowess of free software, and think that it can’t compare to proprietary programs like Photoshop, Zbrush and Maya. This post proved them wrong.
Here’s a short film made by the Blender Foundation entirely with open source software.
There have been more recent (and technologically advanced) films like this, but this one is my favourite.
I hope you enjoy it.