The big list of license games.
==Source Engine==
-Valve Produced
Day of Defeat: Source
Counterstrike: Source
Team Fortress 2
-Third Party
Vampire: the Masquerade: Bloodlines - First Person RPG based on White-Wolf's V:tM franchise. Made by Trokia (Now defunct), and is being supported with fan-made patches.
http://www.troikagames.com/Unknown Arkane Studios Game - Arkane Studios, makers of the fantastic (IMO) RPG Arx Fatalis licensed the engine for their upcoming game, which could very well be Arx Fatalis 2.
http://www.arkane-studios.com/Twilight War: After the Fall - Another RPG being made by Smiling Gator Productions, this is unique in that it's going to be a MMORPG. It'll be interesting to see how it goes.
http://www.twilightwar.com/And, of course, Sin Episodes was announced on the Source engine recently.
http://www.sinepisodes.com==Doom 3 Engine==
-Id Produced
Quake IV - Singleplayer FPS, based on the id Quake II IP and made for them by Raven Software.
http://quake4.ravengames.com/Enemy Territory: Quake Wars - Another game based on the Quake II IP, this time being a team-based multiplayer experiance. Currently in development by Splash Damage for id Software.
http://www.enemyterritory.com/-Third Party
Prey - Ressurection of the old 3D Realms' portal game. Currently being developed by Human Head for 3D Realms.
http://www.prey.com/Even if you use all three Doom 3 games vs the third party Source engine games, Source still has more licenses.
Still, this is a far cry from the days of Unreal and Quake III.
EDIT: I'll learn how to spell license one of these days.
EDIT2: Made it purdy.
This comment was edited on Jul 10, 00:00.