Unreal Tournament 2004
Unreal Tournament 2004 (PC, 2004) has code that decompiles almost back to source, OldUnreal/UT2004Patches, and 1 other public project, including an official source code release. An agent environment already wraps it.
Data checked 2026-10-12 · unbaked registry
Projects
Readable bytecodeUE2 UnrealScript; dedicated server725 starspushed 2026-10-07custom licenserelease 3374-preview-23
GitHub
Unreal Tournament 2004
Source releaseUnrealScript on closed engine
Wikipedia: source-available (non-OSI license and/or partial SDK code); source released ? by/for Epic Games. Game code was officially released.
What you need
You need your own copy of the game: these projects ship code only.
Agent environments
More on PC
GameMethodYearStarsLast push
PCMindustrySource releaseAgent environment201929k2026-10-11PCosu!Source releaseReadable bytecode+1200719k2026-10-12PCCommand & Conquer Remastered CollectionSource release202021k2025-01-16PCRollerCoaster Tycoon 2ReimplementationAgent environment200216k2026-10-12PCDune 2000Reimplementation199818k2026-10-11PCAge of Empires IIReimplementation199914k2026-10-03PCCataclysm: Dark Days AheadSource release201313k2026-10-12PCCivilization VSource releaseReimplementation201011k2026-10-12Found via en.wikipedia.org/wiki/List_of_commercial_video_g
GitHub data checked 2026-10-12. Notes are summaries from the research pass; the project pages are the authority.