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Box art for Doom 3
MODMod · 2004 · id Tech 4

Doom 3

2 projects let you play Doom 3 together. Here's how they compare, and which one to start with.

B
Recommended

OpenCoop

Rated B (Playable), above LibreCoop (dhewm3) at C. It has story co-op.

Website ↗

Every project, side by side

Recommended

OpenCoop

B
PlayableYou can play together, with known gaps in what syncs or a rough setup.
Stage
Partial
Co-op
76%
Synced
  • See each otherUnknown
  • StorySynced
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Direct IP
Players
4
Tested
Player reports
Features
Story co-opPlayer reports
Latest release
No release yet
Last activity
Unknown
GitHub stars
-
About this project

Older co-op mod for up to 4 players over LAN or internet, covering the base campaign, Resurrection of Evil and 42 custom maps. A Steam guide explains running it with fs_game launch options.

What you need

Your own copy of Doom 3.

Sources
Project page ↗Suggest a correction

LibreCoop (dhewm3)

Stradex

C
RoughAlpha builds, or partial sync without the story. Expect desyncs and crashes.
Stage
Partial
Co-op
60%
Synced
  • See each otherUnknown
  • StoryUnknown
  • EnemiesUnknown
  • WorldUnknown
  • ItemsUnknown
Players say
Rate it and vote on its co-op %
Connect
Not stated
Players
Not stated
Tested
Not checked
Features
Open source
Latest release
No release yet
Last activity
Stalled Jan 19, 2026
GitHub stars
67
About this project

Open source (GPL-3.0) co-op for the dhewm3 port covering Doom 3 and Resurrection of Evil. Repo has 391 commits and 40 open issues, no tagged releases on GitHub.

What you need

Your own copy of Doom 3.

Sources
Repository ↗Suggest a correction

Know another co-op mod for Doom 3? Submit it.