Nokia Mobile Internet Toolkit is a good mobile design tool to use.
Pascal vd Heiden
Revolutionary map editor for Doom and games based on the Doom engine.
Build-a-lot 3: Passport to Europe is a strategy game with a real-estate theme.
Iguana Entertainment Limited
Empire Builder: Ancient Egypt is an interesting and enjoyable strategy game.
MMB is an authoring software to develop auto-run menus, multimedia applications.
Build it! Miami Beach Resort is a time-management game.
Manic Digger is an open-source implementation of block-building games.
Team001 (Mike Weir)
A tool for building games to share on PC and mobile devices.
Makes Visual Studio a powerful tool for building games with Unity.
A program for signing Nokia SIS/SISX applications, games and themes very easily!
Kinook Software, Inc.
Automate building and deployment of web apps, games, and desktop software.
SN Systems Ltd.
A suite of tools for building, debugging and tuning console games.
The Vassal Team
Vassal is a game engine for building and playing online games.
The AnyLogic Company
Anylogic is a Simulation software for building web based business games.
Enables live world building for C#/XNA-powered 3D games.
VIO Systems Limited
A random building floorplan and layout generator for role-playing games.