Blender 2.75 Offers 3D Stereoscopy in Rendering and in 3D Work View Too!
Blender is a notoriously excellent free 3D modeling/animation;/redering combo software used by many professional studios. Version 2.75 is coming with a lot of features.
Blender now fully supports the ability to create stereoscopic 3D images. There's support for everything from the good old red/cyan anaglyph stereoscopic display, to more advanced interlacing and page flip 3D display techniques. The support for stereo isn't just in final rendering, either; it's also available in the 3D interface view.
Bonus : watch the Cosmos Laundromat trailer here under !