The Dark Mod is a free and open-source software first-person stealth video game, inspired by the Thief series by Looking Glass Studios.

The game provides the basic framework and tools (engine, assets, models, and editor) for more than 170 fan-made missions, including several multi-mission campaigns.

This includes a crossover of elements of fantasy, the Late Middle Ages, the Victorian era and the Industrial Revolution.

It includes models, sounds, AI, art, tools, and a specialised editor for users to create custom missions.

[1] The Dark Mod has been featured and reviewed by a number of major game magazines, websites and blogs.

[13] In 2014 The Dark Mod was named by PCGamer among the "Ten top fan remade classics you can play for free right now".