http://unity3d.com/
http://www.yoyogames.com/gamemaker
http://www.visionaire-studio.net/cms/adventure-game-engine.html
http://dead-code.org/home/index.php/games/
http://www.udk.com/
http://www.garagegames.com/
http://www.adventuregamestudio.co.uk/
http://pipmak.sourceforge.net/index.php
