1) 0 A.D. and Xonotic are high quallity
2) Honestly, this would suck with free software only.
3) Blender can do wonders.
4) There are no limits: As long as you have gcc you can do anything. As a programmer you can check out FSF high priority project list ( http://www.fsf.org/campaigns/priority-projects/ ), otherwise reporting bugs upstream and spreading the word about free software is good idea as well.

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