The Dark Mod

The Dark Mod is a single-player Doom 3 total conversion mod by Broken Glass Studios. The mod intends to convert Doom 3 into a dark mediaeval stealth game, and draws inspiration heavily from the Looking Glass Studios / Ion Storm game series Thief.

Plot
The mod features several new weapons familiar to Thief players (sword, non-lethal blackjack, bow with different types of arrows), enemy AI and player movement system that takes into account hiding in shadows and noises generated when walking on different surfaces; also included are appropriate tweaks to the physics engine.

Development
Currently the primary goal is to release a toolkit for map/mission makers - to allow modding in very similar to the fan missions of Thief series - but the final version will also include a campaign.

The first alpha version, with one short playable map (Thief's Den) was released in January 18, 2008. Second one release a month later. One year later, they finally release a full version of it a full version of it. In recently news, the project is ongoing to be standalone. So in the future, fans won't required the full original Doom 3 game to play it anymore.