Half-Life: Opposing Force
Half-Life: Opposing Force (PC, 1999) has an open-source reimplementation, eukara/freegearbox.
Data checked 2026-10-13 · unbaked registry
Projects
ReimplementationQuakeC on Nuclide19 starspushed 2025-02-01ISC license
Clean-room reimplementation of Opposing Force in QuakeC.
Clean-room reimplementation, WIP ()
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What you need
Check each project for what game data it needs. Code here is linked, never game files.
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 releaseReimplementation201011k2026-10-12GitHub data checked 2026-10-13. Notes are summaries from the research pass; the project pages are the authority.