iD Software uber-programmer John Carmack hinted on Slashdot that Quake 3 may soon go open source.
By the end of the year. There are still a lot of higher priority things, but it is coming soon.
That would be a tremendous boon to a lot of folks trying to write open source games and simulation packages. iD Software is doing an exceptionally cool thing by releasing its older engines into open source.
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