http://www.gameprogrammer.co.uk/
3D Adventure Studio will be an editor for creating adventure games in style of Gabriel Knight 3 (WIN)
3D Game Engine alpha release of an unfinished 3D game engine (DOS/GNU/Linux)
3D Game Studio produce 3D realtime applications - demos, adventures, role playing, action, advertising, or racing games - without programming skills (WIN)
3D Rad a free realtime full programmable 3D engine (WIN)
ACTION freeware adventure game editor and player (WIN)
ADRIFT a simple, yet powerful IF game designer (WIN)
Adventure³ an integrated development system for producing professional-quality true 3D adventure games (WIN)
Adventure Builder text adventure authoring system (DOS/WIN)
Adventure Construction Kit create your own roleplaying/adventure games ala the early Ultima games (DOS)
AdventurEd system in development for creating graphical adventure games (Amiga)
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)
Adventure Gamer easy-to-use, full-featured toolkit that lets you create board mazes with items to find and use, characters to interact with (Win 3.1+)
Adventure Game Studio (fka Adventure Creator) 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. (DOS)
Adventure Maker 2 make your own 1st person adventure games with no programming or scripting required (Win95+)
AGAST Adventure Game Authoring System to create and play your own graphic adventure games like those from LucasArts and Sierra On-line (WIN)
AGT Adventure Game Toolkit for creating text adventures with graphics and sound (DOS)
ALAN for creating interactive fiction (Amiga/Unix/DOS)
Alice create your own scripts that control the motion of 3D objects for games, training simulations, etc (WIN95+)
AMOS get the source code for the classic Amiga game creation program (Amiga)
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)
BEE easy tile based RPG engine (WIN)
Blitz Basic the legendary Amiga Basic compilier for the PC (WIN)
Blades of Exile a fantasy role-playing system (WIN/MAC)
Blender free and fully functional 3D modeling/rendering/animation package, including games (Unix/Windows/BeOS)
The Bluespere Project text adventure creation software that is in development (WIN/DOS)
ButtonTalk easy to use tool for creating interaction fiction (MAC to create, exports HTML)
CAECHO a program for creating interaction fiction (not sure of platform, the docs are in Spanish)
CAT Creative Adventure Toolkit: adventure authoring utility for writing text adventures on your PC (WIN)
Create Graphic Adventures a simple to use program for making graphic adventures (WIN)
CGMP game creation system that features a built-in 3D engine (DOS/WIN)
CIA Create Interactive Adventures, an EXTREMELY SIMPLE to use program for making text adventures., complete with demo game (DOS)
Classic Adventure Writer create a wide range of adventure games which can include 100 locations, with seperate graphics and sounds for each location with no programming required (WIN 95/NT)
Clean Game Library learn a way to easily create your own scrolling platform games with only little programming (WIN)
Coldstone the most complete solution for developing games on the Macintosh (MAC)
Corndog Megazeux/ZZT-inspired game creation system - project abandoned but source code is available (DOS)
Create Your Own Adventure Games with Zeke creativity playground where kids design and write multi-outcome, interactive stories using three wacky and easy-to-use tools (WIN/MAC)
Crystal Space free (LGPL) and portable 3D engine written in C++ (WIN/MAC/DOS/LINUX)
Dark Basic BASIC language that lets you create fast full-screen DirectX and Direct3D games with incredible ease. You can write a 3D game in minutes! (WIN)
DC Games tool kit for creating the hottest CRPGs available (DOS)
Delver shareware single-player overhead-view tile-based computer RPG construction kit written in Java (JAVA)
Digital Loca-Lite 3D authoring tool, especially designed for beginning 3D-Game-makers (Win95+)
DIV Games Studio programming language that has been designed exclusively for the creation of games (WIN
Divinty RPG maker/editor (MAC)
DUNG graphical MUD builder (WIN95/NT, Unix)
DX Creator dedicated creation tool for producing professional PC graphic based programs (WIN)
EdPack authoring tool for graphic adventures. Site is in Spanish but based on the translation I got from AltaVista, program sounds promising.
Erasmatazz Authoring tool used to create interactive storyworlds (WIN/MAC)
Explorations Role Playing Game System full featured RPG creation tool (WIN)
FreeCraft free real-time strategy game engine (WIN)
FST Flight Simulation Toolkit; a suite of programs that enables non-programmers to design complete flight simulators (WIN)
GamesBasic for creating lightning fast games, demos or windows applications
Game Builder Lite for creating animated adventures and educational programs (DOS)
Game Maker make games like Pacman by just using some simply clicking and drag-and-drop with your mouse (WIN)
GameMaker & GameMaker Lite simple, card-based development system that enables you to create simple adventure games with graphics, buttons, and text (MAC)
GameStep new way of creating multimedia content or games which combines the qualities of Java, rapid development and platform independence, (WIN/MAC)
GAUGE will be able to support any sort of 3D game, including first person shooters, real time strategy, simulations, and more
Genesis 3D a completely free 3D gaming engine (WIN)
Glumol clone of the mythical LucasArts SCUMM engine (WIN)
GRAAL script-based Graphic Adventure Authoring Language (Amiga)
HUGO a programming language and authoring system for interactive fiction (WIN/DOS/Linux)
Hyerplay multimedia authoring engine for adventures and other games (WIN/OS2)
IndianaJava system to create and run 2D graphic adventure games (JAVA)
Inform a design system for interactive fiction (WIN/MAC/Amiga)
InterAx create games in an easy to use yet powerful visual environment without programming or scripting. (WIN95+)
JAFFACAKE Jave Application Framework for Adventure Creation, Appropriate Klasses Enclosed (JAVA)
Jamagic (fka JAMA3D) if you can program your web page, you can program your 3D game in JAVA Script; also be sure to visit JAMA3D Programmers Guild an official support site for JAMA3D (Win/MAC/Linux)
JAVA Game Creator complete development environment for creating multimedia applications like adventure games (JAVA)
LucasHacks the ultimate SCUMM hacking resource including the new SCUMM Revisited (WIN)
LSD for creating web-based interactive fiction (JAVA Script)
MAC Game Creator Toolkit CD ROM special registered versions of 5 MAC creators, plus tutorials, utilities, and sample games (MAC)
Macintosh Game Creation Society information about and downloads for MAC game creators (MAC)
MAGE for creating interaction fiction (UNIX/Linux)
Magx compiler for creating text adventures which is downward compatible with all of the existing versions of the AGT language(DOS/Linux)
Maker 1 & Maker R2 script-based adventure game editor for the creation of LucasArts-like games (DOS/WIN)
MediaForge an event-driven, object-based authoring tool (WIN)
Megazeux an object oriented ANSI game maker with many features not found in ZZT (DOS)
M.U.G.E.N. program that enables you to build your own 2D fighting game (WIN)
Multimedia Fusion create exciting interactive applications with a mouse-driven interface - this is the one I use (WIN)
Nautilus Engine create a retail quality game by writing less than 100 lines of C (Win and Visual C++)
Official Hamster Republic RPG Construction Engine create your own role-playing games with no programming experience (DOS)
OZ Project technology and art to help artists create high quality interactive drama, based in part on AI technologies
PAWS IF authoring system (Various)
Pie 3D Game Creation System make your own 3D action games (DOS/WIN)
QTAC the quick text adventure creator (DOS/WIN95+/JAVA)
Quest Axe Software's app that allows you to create your own text adventure/RPG games, quickly and easily. (WIN95+)
QuestMaker for making graphical adventure games (DOS)
REXX Adventure text adventure engine (OS2 Presentation Manager)
ROBOT a program you can use to create computer adventure games (this is the continuation of the BOT project that was recently dropped by it's original programmer) (WIN)
RPGMaker.net site for top 3 RPG makers(WIN)
RPG Toolkit Development System create true graphical RPG games (DOS/WIN under development)
RuneSword RPG game and construction set (Win95+)
SAGE Story System ScienceFact Adventure Game Engine - a development system that allows a developer to utilize script files to make a graphical adventure games (WIN)
The SCRAMM Project info on the project of making a SCUMM-like adventure script creation tool (WIN)
Shadows game development engine for RPGs, dungeon crawler "roguelike" game like diablo and graphic adventures like dreamweb (DOS/WIN95)
Sphere RPG engine specialized for making 2D, console-style RPGs, similar to Final Fantasy and Phantasy Star (WIN)
Spritech isometric game engines (MAC)
Stagecast create multi-level games, mazes, puzzles and simulations for the Web, using the mouse to demonstrate what you want each character to do(MAC/WIN)
StoryHarp Audioventure Authoring System adds the dimension of voice to interactive fiction development (WIN95/NT)
StoryMaker create your own interactive fiction games (MAC)
STOS get the source code for the classic AtariST game creation software (AtariST)
SUDS adventure game system which combines the content and feel of a text adventure game with the point-and-click style of Windows (WIN)
TADS text adventure development system (DOS/WIN/MAC/Amiga/AtariST/OS2/Acorn)
Territory of Fottifoh write your own adventure games with a special hypertext language (DOS?)
Text Adventure Dreams a service that will write your text adventure game for you
Text Game 3.0 design an entire world of creatures and warriors for personal, Internet, and network play (WIN)
TROAICS upcoming engine - an acronym for Text Rooms and Objects Interactive Adventure Creation System (WIN)
UA Win freeware program similar to the Unlimited Adventures program released by SSI (WIN/MAC/Linux)
Ultimate AGI & SCI Web Site great resource for demos, games, utilities
WinQuill port of the classic spectrum adventure writer (WIN 95/98/ME/NT/2000)
VERGE a role-playing game creation system (DOS)
WABFIT create a multipath story for the web (WIN)
World Builder create your own adventure games (MAC)
ZZT an object oriented ANSI game maker from Epic Megagames (DOS)