Id Software

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.