Cyberarts
CyberArts' Foundation™ platform powers Poker, Backgammon, Blackjack, 13-Cards or any other game of skill
http://www.cyberarts.com/
DreamPath
Free software to produce CYOA-type interactive fiction easily
http://drakevision.com/index.html
Game Salad
a Mac OS X based game creation system for non-programmers
http://gamesalad.com
Icreon Game Development
Icreon Game Studio A Game Development Company Offers 3D Java Game Design along with Character Animation
http://www.icreongamestudio.com/
Novashell Game Creation System
a high-level 2D game maker that tries to handle all the hard work behind the scenes allowing you to whip up sweet games using path finding, dialog, persistent dynamically sized maps
http://www.rtsoft.com/novashell/
Original3D Game Creator
Original3D is a simple yet powerful tool for game creation - simple, because its based around the popular and easy to use BASIC programming language; and powerful, you can arrive nice effects & create a simple game in 30 minutes.
http://www.original3d.com/
Sandbox 3D Game Maker
open source easy to use standalone 3D Game Maker and 3D open source easy to use standalone 3D Game Maker and 3D Game Design program currently based on the cube 2 engine being used in many schools throughout the world
http://sandboxgamemaker.com/