id Software, maker of cool violent games, e.g:

* CommanderKeen (hmmm not sure if this really counts as violent, and also it isn't strictly by id, and was created under the name Apogee -- JonathanWhiting) (''It's got the 'Id' name all over it. Apogee '''published''' a number of Id's earlier games, including Keen and WolfensteinThreeDee.'')
* WolfensteinThreeDee
* Doom
* Doom II
* QuakeGame
* QuakeTwo
* QuakeThreeArena
* Doom III
* QuakeLive

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See JohnCarmack.