The source code for Prince of Persia was released today from the original Apple 2 port:

https://github.com/jmechner/Prince-of-Persia-Apple-II

Awesome to see this sort of thing happen regularly. A few companies I respect have released source for some awesome games like Sim City, Doom 3, Quake 3 & Duke Nukem 3D.

Seeing this kind of thing is awesome because it allows these classic games to live on well beyond they are fiscally viable to keep running on modern systems. I believe culture should be preserved and source released of old games helps that.

Heres hoping that old games like Warcraft Orcs and Humans, Unreal Tournament and Mario Brothers see a source release at some point.

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SimCity:
http://www.donhopkins.com/home/micropolis/

Doom 3:
https://github.com/TTimo/doom3.gpl

Quake 3:
http://ioquake3.org/

Duke Nukem 3D:
http://en.wikipedia.org/wiki/Duke_Nukem_3D