The Dark Mod mod for Doom III

In The Dark Mod, you play a master thief living in a dark, sprawling city. A blend of gothic architecture and steampunk technology, the city contains great, belching chimneys, grand cathedrals, and medieval manor-houses. As a master of the shadows, you move through the city streets unseen, avoiding the eyes (and blades) of the city's thieves' guild, while doing jobs for the various political factions. Nobles, mages or the Church, it doesn't matter, as long as the pay is good.

In technical terms, our goal is to create a complete conversion of the Doom 3 platform, turning it into a stealth-based game. We will be creating new and improved AI, and new models and textures that support a 'steampunk' genre made popular by Looking Glass Studio's "Thief" franchise.

This mod is, first and foremost, a toolkit.  Although it will ship with some playable maps, our goal is to provide people with all the tools necessary to create their own Medieval Steampunk Fan Missions.