What IDE does John Carmack of id Software use? Visual Studio?
stonemetal: 20 seconds in google turned up an ask slashdot from '99 where he claims to use msdev because of intellisense and edit-and-continue.  He claims to spend time regularly in each of the big three oses. And that the bsp code for doom was written in objective-c(so more than likely not written in VS.)Here recently he is porting games to iPhone some how I doubt he used VS to do that.  It rather sounds like he is a right tools for the job sort of fellow, and doesn't stick to one dev environment.