GoldSrc

GoldSrc (also known as Goldsource) is the retronym used internally by Valve Software in reference to the heavily modified Quake engine that debuted with the release of their science fiction first-person shooter video game Half-Life. The engine also powered future titles developed by or with oversight from Valve, including Half-Life`s expansions, ....
Found on http://en.wikipedia.org/wiki/GoldSrc
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