Abandonware Games With Public Source Code2002–2010

Commercial and abandonware-era games released roughly between 2002 and 2010 (or whose source code went public in that window) where the source is obtainable today — grouped by genre. Compiled from publisher source releases, GPL/open-source ports, and community repositories.

FPS / Shooter

Game	Year	Source	Notes
Dark Forces	1995	Raven · GitHub, 2008	Jedi engine open-sourced — assembly-heavy FPS
Tron 2.0	2004	Monolith · public, 2007	Full source released
Half-Life	1998	Valve · GitHub, 2007	Source dropped publicly
Team Fortress Classic	1999	Valve · ~2004	Released with an update
Quake III Arena	1999	id · GPL, 2005	→ ioquake3 engine
Quake II	1997	id · GPL, 2001	→ quakespasm / yquake2
Quake	1996	id · GPL, 1999
Wolfenstein 3D	1992	id · 1999	Non-commercial license
Rise of the Triad	1994	Apogee · ~2002	In fragglet/raycasters
Duke Nukem 3D	1996	3D Realms · 2000	→ EDuke32, Raze
Shadow Warrior / Blood	1997	Ken Silverman · ~1998	Build engine sources
Marathon trilogy	94–96	Bungie · 2000	→ Aleph One engine
Natural Selection	2002	GPL	Half-Life mod
Sven Co-op	2002	GPL	Half-Life mod
They Hunger	2005	GPL	Half-Life mod
AssaultCube	2006	zlib	Quake3-derived
Soldat	2004	GPL	2D side-view shooter
Nexuiz	2005	GPL
Warsow	2005	open source	Public ~2008
Alien Arena	2004	GPL
Smokin' Guns	2005	GPL	RTCW mod
OpenArena	2005	GPL	Quake3 community edition
Sauerbraten	2004	zlib	Cube-derived engine
Tremulous	2006	GPL
Chocolate Doom	2007	GPL	Doom source port
Odamex	2008	GPL	Doom source port
Zandronum	2005	GPL	Doom source port
Freedoom	2003	GPL	Doom engine, open assets
DarkPlaces / FTEQW / ezQuake	2004	GPL	Quake engine ports
Vavoom / Crispy Doom / ZDoom	05–08	GPL/PD	Doom engine ports
Urban Terror	2007	released by UTP	Verify license
RTCW / Enemy Territory	01/03	Splash Damage · 2010	Borderline — just outside window

Action / Platformer

GTA Vice City 2002 — Rockstar source, 2003
Secret Maryo Chronicles 2006 — GPL platformer
X-Moto 2005 — motocross platformer
SuperTuxKart 2004 — kart racer
OpenLieroX 2004 — action platformer
OpenClonk 2007 — Worms-like
Open Surge 2008 — Sonic-like engine/game
Neverball / Neverputt 2001/04 — physics puzzler

Strategy / Sim / City-builder

OpenTTD 2004 — transport sim
Unknown Horizons 2008 — city builder
OpenCity 2005 — SimCity clone
Simutrans 2002 — transport sim
FreeCol 2003 — Colonization clone
MegaGlest / Glest 2004 — 3D RTS
Wargus / Stargus 2001–02 — Warcraft clones
OpenRA 2010 — C&C/Red Alert engine, borderline
Battle for Wesnoth 2003 — turn-based tactics
Hedgewars 2004 — Worms-like
FreeOrion 2003 — 4X space sim

RPG / Adventure / Horror

The Mana World 2004 — 2D MMORPG
Stendhal 2004 — MMORPG
Ryzom 2004 — MMORPG
Kingmaker 1998 — BioWare source released publicly

Puzzle / Arcade

Frozen Bubble 2002 — Puzzle Bobble clone
Pingus 2002 — Lemmings clone
Liquid War 2002 — puzzle/action
LBreakout2 2004 — Arkanoid clone
Fish Fillets NG 2004 — puzzle
GNOME Games various — collection of small games

Space / Flight sim

Vega Strike 2004 — space sim
Naev 2003/08 — space trading sim
Endless Sky 2009 — space trading sim
Pioneer 2003 — space sim
AstroMenace 2004 — shmup
FlightGear 1997 — flight sim

Possibly matching the original hunt

If the game was PC, DOS-era-ish, looked impressive for its size, and had obtainable source — top guesses: Dark Forces (2008 source drop, assembly-heavy Jedi engine) or Rise of the Triad (~2002 source release). Console/handheld would be a different hunt.

Caveats: "Source available" ranges from official GPL releases to publisher drops (Valve, id, Raven, Monolith, Bungie, Rockstar, Splash Damage). Licenses vary — Wolfenstein 3D is non-commercial only; Dark Forces is GPL; Doom ports differ per project. Verify each repo's license before reuse. Urban Terror and RTCW/Enemy Territory sit at the edge of the date window.