Great open source software:
3D Graphics
* Blender 3d – Produce professional quality 3D graphics, animations, movies, etc. (also edits movies)
* Luxrender - Works great with Blender3D. Simulates light and produces Photo-realistic renders.
Photo Editing
* The GIMP – For professional quality photo editing.
DVD Authoring
* DVD Flick – Converts video formats to DVD format