By the way, Quake, Quake 2 and Quake 3 can legitimately have source engines used with them by the way to get around CEG, if that's any help.
I know, but I think there should be a separate list for those. Or perhaps a separate section.
Assorted list of games confirmed to use CEG:
Orcs Must Die!, The Baconing, GTA: San Andreas, Xotic, Aliens versus Predator Classic 2000, And Yet It Moves, Darwinia, Indiana Jones and the Last Crusade, Gish, Indiana Jones and the Fate of Atlantis, Jolly Rover, NightSky, Loom, Sequence, Chime, Hammerfight, Beyond Good & Evil, The Dig, Dustforce, Freedom Force, Shatter, Mafia, all Half-Life games (surprise), Grand Theft Auto 3, Nikopol: Secrets of the Immortals, Mount&Blade, Morrowind, Penumbra (all of it), Poker Night at the Inventory, Gothic II, Puzzle Agent 2, Sam & Max (all of them), X-COM: Interceptor and Enforcer