2D Shooter Game Creator
The 2D shooter game creator will let YOU create your own games~ in the style of classic lightgun games~ e.g. Time Crisis
http://redsparkstudios.co.uk/2dsgc.htm
3D Adventure Studio
an editor for creating adventure games in style of Gabriel Knight 3 (WIN)
http://3das.noeska.com
3D Game Engine
alpha release of an unfinished 3D game engine (DOS/GNU/Linux)
http://www.dotsphinx.com/software/demo3d/
3D Game Studio
produce 3D realtime applications - demos~ adventures~ role playing~ action~ advertising~ or racing games - without programming skills (WIN)
http://www.conitec.net/english/gstudio/
3D Rad
a programmable~ user-friendly~ 3D real-time engine (WIN)
http://www.3drad.com/
3DCakeWalk
allows the development of commercial quality games with all the "state of art" features you will find in today's leading games
http://www.3dcakewalk.com/
Abstract RTS Engine
An RTS engine under development intended for user-produced rules~ AI~ and media modules (mods)
http://sourceforge.net/projects/abscnc/
ADePT
adventure developing and playing toolkit
http://www.sesseler.de/Adept/adept_en.html
ADRIFT
a simple~ yet powerful IF game designer (WIN)
http://www.adrift.org.uk/
Adventure Book
CYOA creator
http://www.ingold.fsnet.co.uk/software.htm
Adventure Builder
text adventure authoring system (DOS/WIN)
http://www.conroyhome.net/alan/ab/index.htm
Adventure Game Engine
engine for creating graphical first-person adventure games with full support for inventory~ save/load games~ inventory~ puzzles~ conversations~ full motion video~ cutscenes (WIN)
http://www.twilightsoftware.com/age/
Adventure Game Studio
make your own point and click adventure games without programming; recently rewritten~ now supports the standard Sierra interface as well as the LucasArts interface. Very nice. (WIN)
http://www.adventuregamestudio.co.uk/
Adventure Maker
free toolkit to creat point-and-click software for Windows and PSP without programming(Win/PSP)
http://www.adventuremaker.com/
AdventurEd
system in development for creating graphical adventure games (Amiga)
http://hem.passagen.se/drost/amiga/AdventurEd.html
AGAST
Adventure Game Authoring System to create and play your own graphic adventure games like those from LucasArts and Sierra On-line (WIN)
http://www.allitis.com/agast/home.html
AGT
Adventure Game Toolkit for creating text adventures with graphics and sound (DOS)
http://www.markwelch.com/agt.htm
Aiee!
design text adventures without programming experience
http://markdamonhughes.com/Aiee/
ALAN
for creating interactive fiction (Amiga/Unix/DOS)
http://welcome.to/alan-if
Alice
create your own scripts that control the motion of 3D objects for games~ training simulations~ etc (WIN95+)
http://www.alice.org/
Antiryad Gx
easy multi platform game creator tool
http://www.arkham-development.com/
AZALTA
system with endless adventures~ an infinite number of large worlds to explore~ hundreds of puzzles to solve~ creatures to meet~ and items to find -- you can even create your own worlds/creatures/items (WIN/Amiga)
http://www.the-underdogs.info/game.php?id=3093
Blades of Exile
a fantasy role-playing system (WIN/MAC)
http://www.spidweb.com/blades/BOEpress_rel.html
Blender
free and fully functional 3D modeling/rendering/animation package~ including games (Unix/Windows/BeOS)
http://www.blender3d.org/
Blitz Basic
the legendary Amiga Basic compilier for the PC (WIN)
http://www.blitzbasic.com/