XIII

XIII (PC, 2003) has a partial official source release, Ch0wW/xiii_unrealscript, and 1 other public project, including an open-source reimplementation.

Data checked 2026-10-12 · unbaked registry

Projects

xiii_unrealscript

Source releaseUnrealScript16 starspushed 2018-01-07no license

XIII UnrealScript source code

Wikipedia: source-available (non-OSI license and/or partial SDK code); source released 2018 (partly) by/for Ubisoft Paris. The UnrealScript source code of the game was made available on GitHub in January 2018.

xiii-engine

ReimplementationC++ (UE1-style reimplementation incl. UnrealScript VM)0 starspushed 2026-05-26no license

XIII Engine — C++ reimplementation of Unreal Engine 1 for XIII (2003). Cel-shaded FPS with BSP renderer, UnrealScript VM, GLES2. Targets R36S.

Early WIP (2026) ()

What you need

You need your own copy of the game: these projects ship code only.

More on PC

GameMethodYearStarsLast push

PCMindustrySource releaseAgent environment201929k2026-10-11 PCosu!Source releaseReadable bytecode+1200719k2026-10-12 PCCommand & Conquer Remastered CollectionSource release202021k2025-01-16 PCRollerCoaster Tycoon 2ReimplementationAgent environment200216k2026-10-12 PCDune 2000Reimplementation199818k2026-10-11 PCAge of Empires IIReimplementation199914k2026-10-03 PCCataclysm: Dark Days AheadSource release201313k2026-10-12 PCCivilization VSource releaseReimplementation201011k2026-10-12

Found 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.