Unreal

Unreal (PC, 1998) has an open-source reimplementation, dpjudas/SurrealEngine, and 1 other public project, including an official source code release.

Data checked 2026-10-12 · unbaked registry

Projects

SurrealEngine

ReimplementationC++ reimplementation of Unreal Engine 1; runs original UnrealScript b…1,115 starspushed 2026-10-11custom licenserelease nightly

Unreal Engine 1 Reimplementation

WIP; UT99 maps playable; also used by Flipendo (Harry Potter 1/2)

Unreal

Source releaseUnrealScript (game code) on closed Unreal Engine

Wikipedia: source-available (non-OSI license and/or partial SDK code); source released 2008 by/for Epic MegaGames. Headers and some code distributed with the official SDK. Also, some pre-release version (v0.87) is available on the internet…

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, rockpapershotgun.com/2012/11/12/patchy-like-its-, dsogaming.com/news/epics-tim-sweeney-says-that-u

GitHub data checked 2026-10-12. Notes are summaries from the research pass; the project pages are the authority.