Develops technology and art to help create high quality interactive drama. This especially means building believable agents in dramatically interesting micro-worlds.

XML-based Interactive Fiction Markup Language (IFML) used to create text adventures that run in your browser. Includes a sample game with IFML code, documentation, tutorials, downloads, mailing list, and a forum.

Software for creating and using interactive storyworlds.

SLUDGE (standing for Scripting Language for Unhindered Development of a Gaming Environment) is a system by which anyone (within reason) can make an adventure game.

Use Visionaire to create a complex adventure game without the need of any programming experience. Offers information about how to use the software and what to do with it.

Wintermute Engine Development Kit is a set of tools for creating and running graphical "point&click" adventure games. The kit includes the runtime interpreter (Wintermute Engine, or WME) and GUI editors for managing and creating the game content (WME tools) as well as the documentation, demonstrational data and prefabricated templates.