Call of Duty and Medal of Honor both used id Tech 3 (aka the Quake 3 engine), as did some of the Star Wars games, etc. Unfortunately, The Source Engine came out

Call of Duty and Medal of Honor both used id Tech 3 (aka the Quake 3 engine), as did some of the Star Wars games, etc. Unfortunately, The Source Engine came out around the time of id Tech 4, and it really took the reins, with Unreal Engine hitting a stride thereafter. https://en.wikipedia.org/wiki/Id_Tech_3#Games_using_a_proprietary_license https://en.wikipedia.org/wiki/Id_Tech_3#Games_using_a_propri...