I'm going to scoff at this. I believe that the Unreal engine source was GPL'd at some point. I know that Quake 3's engine was GPL'd, I think. However, the engine is quite complex. UT ran alright on my old Pentium III at 500 MHz and an nVidia TNT2 (32 MB), but it wasn't stellar. And there's a difference between 333 MHz MIPS and 500 MHz x86.
Besides, the source code for the engine may be GPL'd, but that doesn't mean that the game content is.
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