Just have to chime in with one more "Quake changed my life", though perhaps even more so than most - loving Doom to death, I was _utterly_ obsessed with Quake modding and map making. Then I sensibly dropped out of college in 1997 and went to Raven Software to work as a programmer, where I got to work with the Quake engine while its paint was still wet, and even more so with Quake 2 while it was being developed. The amount of brilliant co-workers I had who came up through the mod community at that point is actually pretty astonishing, in hindsight.

Thanks id.