The Dark Mod

What The Dark Mod does

The Dark Mod is a free, open-source single-player stealth game inspired by the original Thief series (Thief 1 and 2), set in a gothic steampunk world. Development began in 2004 as a volunteer fan project and the first public release followed in October 2009 as a mod for Doom 3; in October 2013 the project transitioned to a self-contained standalone title, and as of March 2026 the current release is version 2.14. The software is built on the id Tech 4 (Doom 3) engine, modified and extended with custom stealth mechanics, a sophisticated guard AI system with patrol, alert, and search states, soft shadows and volumetric lights, and an integrated in-game mission downloader. The development ecosystem includes DarkRadiant, a customized open-source level editor derived from GtkRadiant and tailored for stealth mission authoring.

The project is maintained by a global team of volunteer developers, mappers, modelers, texture artists, animators, and sound designers, with no formal headcount and no commercial entity, parent company, or institutional funding. The product portfolio comprises the core game, DarkRadiant as a mission editor add-on, and over 100 community-created fan missions distributed through the in-game downloader. The team serves a single persona segment — PC gamers who favor skill-based, atmospheric stealth gameplay — primarily via thedarkmod.com, an official wiki, an active forum (28,854+ registered members), a MantisBT bugtracker, and a ModDB listing.

The business model is structurally non-commercial: the game is completely free to download and play, with no paid tiers, subscriptions, in-game purchases, advertising, or licensing fees, and the source code is publicly available via SVN and GitHub. Distribution is fully self-serve and global, with installers for Windows and Linux (and unofficial Mac support via PlayOnMac). Marketing is word-of-mouth and community-driven, with no formal go-to-market motion or sales infrastructure. The project's long-term sustainability rests entirely on volunteer labor and enthusiast engagement rather than revenue generation.

Name

The Dark Mod

Legal name

The Dark Mod

Website

https://thedarkmod.com

Company type

Private

Founded year

2004

Operating status

Operating

Short description

The Dark Mod is a free, open-source stealth video game inspired by Thief 1 and 2, built on a modified Doom 3 engine and maintained by a global community of volunteer developers for PC gamers seeking atmospheric, skill-based stealth gameplay.

Ownership category

akta.pro rank

Product category

Stealth Video Game

akta.pro primary industry

Game Engine & Creation Platforms (UGC/Modding) (BPAMAKAE)

akta.pro secondary industry

Modding Platforms & Tooling (mods, maps, servers, script hubs) (MPAFAIAB)

Keywords

• Open-source stealth game
• Fan mission modding
• Level editor software
• Gothic steampunk gameplay
• Community game development

GTM type

B2C

Offering type

Software

Cost components

Personnel, Technology or R&D, Infrastructure

Revenue model

1. Free Game Distribution: The Dark Mod is completely free to download and play with no revenue generation. The project is maintained by volunteer contributors and funded by community passion for the stealth gaming genre.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

The Dark Mod is a free, open-source stealth game set in a gothic steampunk world, inspired by the classic Thief series. Players download and play a standalone client that includes built-in tools for installing community-created fan missions, and a separate DarkRadiant level editor enables anyone to author and share new missions.

Product overview

The Dark Mod is a free, open-source stealth gaming experience that began as a Doom 3 mod in October 2009 and became a self-contained standalone game in October 2013. The core product is The Dark Mod itself, a stealth game set in a gothic steampunk world. The product portfolio includes DarkRadiant, an open-source mission editor for creating custom fan missions, and the Fan Missions repository containing over 100 community-created missions downloadable through the game's interface.

Differentiator

Problem solved

Functional benefit

Products and services

• The Dark Mod Free, open-source stealth game set in a gothic steampunk world, inspired by the Thief series. Players navigate stealth-based missions avoiding detection by guards, available for Windows and Linux.
• DarkRadiant Open-source level editor designed for creating The Dark Mod missions, with specialized tools for stealth game mapping, AI behaviour scripting, and entity management.
• Fan Missions User-generated stealth missions downloadable through the in-game mission downloader, offering a large library of community-authored content for The Dark Mod.

Segments1 record

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators5 records

Recent moves5 records

Expansion highlights3 records

Direct peers

• OpenArena: A free, open-source FPS built on id Tech 3 by a community of volunteer contributors. Directly comparable as a free, community-developed shooter built on legacy id Tech engine technology with no commercial monetization.
• Xonotic: A free, open-source multiplayer FPS maintained by an international community of volunteer contributors. Comparable in operating model (community-driven, free-to-play, no revenue model, sustained for over a decade).
• OpenMW: Open-source, community-driven reimplementation of a classic single-player RPG (Morrowind) with active developer base and UGC tooling. Directly comparable to The Dark Mod as a volunteer-led open-source game project preserving and extending a beloved classic IP.
• Freedoom: Open-source, free-to-play Doom-engine game project maintained by a community of volunteers. Highly comparable in mission (free game on legacy id Tech engines), governance (volunteer contributors), and UGC ecosystem.
• Minetest: An open-source, community-driven voxel game engine and game with strong UGC and modding tooling. Comparable as a free, volunteer-maintained game project where user-created content and community tooling are core to the value proposition.
• Cataclysm: Dark Days Ahead: A long-running open-source, community-developed single-player game with no commercial revenue model. Comparable as a multi-decade volunteer project sustained by community passion and UGC tooling.
• Brutal Doom: A long-running, community-developed Doom engine mod that massively extends gameplay and AI. Closely comparable to The Dark Mod as a Doom 3/id Tech era mod that evolved into a standalone experience maintained by volunteer contributors.
• 0 A.D. A free, open-source historical RTS developed by a global community of volunteers (Wildfire Games). Directly comparable as a long-running community-developed game with no commercial revenue and active ongoing releases.

Others

• ModDB: The dominant mod-discovery and distribution platform on which The Dark Mod maintains a public page for community visibility. Not a competitor but the primary external marketing channel and discovery surface for TDM and similar projects.

Emerging players

• GtkRadiant: The upstream open-source level editor from which DarkRadiant was forked. Highly comparable technology stack and mission (id Tech-based level editing), and effectively the parent project for TDM's mission-creation tooling.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• GitHubgithub.com/stgatilov/darkmod_src
• Facebookfacebook.com/profile.php

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about The Dark Mod