Here are a few outstanding open source movies:
A must watch:
http://orange.blender.org/ Elephants Dream is the worldâ€™s first open movie, made entirely with open source graphics software such as Blender, and with all production files freely available to use however you please, under a Creative Commons license.
The short film was created by the Orange Open Movie Project studio in Amsterdam during 2005/2006, bringing together a diverse team of artists and developers from all over the world.
The forum for all ongoing Blender Open Projects is here: http://www.blender.org/forum/viewforum.php?f=20