Fabula

Fabula is a framework and engine for interactive storytelling by means of an adventure game environment. It offers a client-server architecture, an event-based protocol, multiplayer and networking capabilites, a multi-threaded server, an abstract, visualization-agnostic model of a game world, an asset manager, and a plugin system. Gameplay can be recorded and played back. The code is well documented and runs on Linux and MS Windows (it should work on OS X too, but this has not yet been tested). It can be used as a library to develop your own adventure games. As an alternative, you can use the Pygame-based graphical editor and the default game engine that come with fabula.