List of free open source games

[MrFlibble]

This is a list of games that are both free (as in free beer, but in some cases also as in free speech) and open source. Liberated (formerly commercial or shareware) games are marked with an asterisk. Third party source ports, if available, are listed below the respective games' titles.

For a list of closed source free games, please check this thread.

Arcade
Battle Tanks
BattleCity
Bitfighter
Catacomb
Chickens 2
Chopper Commando
Digger Remastered
Falling Block Game
Frozen Bubble
Gladiator*
o Openglad
GLtron
Hyperoid
Jump 'n Bump
o source port
Jumpman Lives!
Knights
Knockin
LBreakout2
Maelstrom*
Neverball
NiL
Open Hexagon
Paku Paku
Rocks'n'Diamonds
Savage Wheels
Snarf
TechnoballZ
Teeworlds
Tower Toppler
Zorx

Artillery
Atomic Tanks
Hedgewars
N.A.T.O.W.
Scorched 3D
Scorched Earth 2000
WarMUX
xscorch

Adventure
Adventure Game Studio [engine/SDK]
o source code
Beyond the Titanic
Beneath a Steel Sky*
Mines
Quest [engine/SDK]
Supernova*

Beat 'Em Up
Open Mortal

Board
GNU Backgammon
JavaRisk
Ludus Regius
NetRisk
OGS Mahjong
OpenFracas
Pioneers
Scrabble 3D
yura.net Domination

Card
PokerTH
PySol
PySolFC
XM Solitaire

Chess
ChessV
DreamChess
GMChess
GNU Chess
PyChess
The Genius
XBoard/WinBoard

First-Person Shooter
The Adventures of Square
o ZDoom
Chex Quest 3
o ZDoom
CodeRED - Battle for Earth [download]
CodeRED - The Martian Chronicles [download]
Crystal Core [Crystal Space 3D engine tech demo]
Cube [engine/SDK]
Cube 2: Sauerbraten
Eternal War: Shadows of Light*
o free full version
o engine source code
o game source code
FPS Creator Classic [engine/SDK]
Freedoom
HACX: Twitch 'n Kill*
o Chocolate Doom
o ZDoom
Harmony
o ZDoom
In Pursuit of Greed
Ken's Labyrinth*
o LAB3D/SDL
o LAB3D/SDL (w/ hi-res texture support)
Marathon Trilogy*
o Aleph One
Open Quartz
OpenQuartz 2
Operation Serpent
o ECWolf
OQPlus
Retribution [engine/SDK]
Shadow Warrior*
o game data
o source port
Shaw's Nightmare
X-Men: The Ravages of the Apocalypse

Multiplayer/Arena FPS
Alien Arena
Arena of Honour
Assault Cube
Assault Cube Reloaded
BZFlag
DDay: Normandy
o source code
o development website
Digital Paint: Paintball 2
fight win prevail
Nexuiz Classic
OpenArena
Quetoo
Red Eclipse
Smokin' Guns
Tremulous
Uebergame
Unvanquished
Warsow
Wolfenstein: Enemy Territory*
o source code
World of Padman
Xonotic
Zero Ballistics

First-Person Stealth
The Dark Mod

Misc
BillardGL
Frets on Fire
StepMania
UltraStar
Word Whiz

Platform
Abuse*
o Abuse for Windows
o Abuse SDL
Because it's fun, Fay
Chaos Projectile
Dave Gnukem [download]
Hurrican
o source code
iiChantra
Mario clone
OpenGGS
Prince of Persia
The Secret Chronicles of Dr. M
Secret Maryo Chronicles
Sint Nicolaas & Zwarte Piet
Smash Battle
SuperTux
Xargon*
o source port
Yo Frankie!

Puzzle
DroidQuest
Enigma
Kentris
Kroz
Numpty Physics
OpenAlchemist
Pingus
Pushover
SDL Scavenger
Sokoban
Tile World
X-Moto

Racing
Armagetron Advanced
Dakar 2011
Dolphinity Racer
ManiaDrive
MiniRacer
Q3Rally
o source code
Speed Dreams
Stunt Rally
SuperTuxKart
T1 Car Racing Simulation
TORCS
Trigger Rally
Ultimate Stunts
VDrift

Real-Time Strategy
0 A.D.
Aleona's Tales
Annex: Conquer the World
o source code
Arrakis
Bos Wars
Clonk*
Clonk 2 Debackel*
Clonk 3 Radical*
Clonk Planet 4.65*
Clonk Endeavour 4.95.5*
Clonk Rage*
Commander Stalin
Dark Oberon
Dungeon Digger
Glest
Globulation 2
MegaGlest
Open Imperium Galacitca*
OpenClonk
OpenDungeons
Retro Island War
Seven Kingdoms: Ancient Adversaries*
SpringRTS [engine/SDK]
Unknown Horizons
Warzone 2100*
Widelands
Wyrmsun
Zero-K

Role-Playing
Amulets & Armor*
o source code
Ardentryst
Blades of Exile*
o Classic Blades of Exile
Erebus
Escape From The Maze
Fall of Imyrin
FLARE [engine/SDK]
FreedroidRPG
GNU FreeDink*
Haxima
Hero of Allacrost
Lips of Suna
LostHero - Story of Gilgamesh
NAEV
RuneSword II*
o source port
o source port (newer version)
Summoning Wars

Roguelike
Angband
Brogue
Dungeon Crawl Stone Soup
Dungeon Crawl Tile Version
o Windows binaries
o source code
Falcon's Eye
Fame
Javelin
Linley's Dungeon Crawl
Moria
NetHack
NetHack 2000
o English Windows Alpha 0.2.0.0
o English v0.3.1.1 source code
Rogue
Rogue Survivor
S.C.O.U.R.G.E.: Heroes of Lesser Renown
SLASH'EM
Tales of Maj'Eyal
TileRogue

RPG Maker
Advanced RPG Maker [engine/SDK]
EasyRPG [engine/SDK]
Mokoi Gaming [engine/SDK]
Open RPG Maker [engine/SDK]
OpenLegends [engine/SDK]
Solarus [engine/SDK]
Sphere RPG Engine [engine/SDK]

Massively Multiplayer RPG
Eternal Lands
PlaneShift
WorldForge

Sandbox
Manic Digger
Minetest
Terasology

Shooter
Alien Blaster
AstroMenace
C-Dogs
o C-Dogs SDL
Catacomb Snatch
Chromium B.S.U.
Cyberdogs
Endless Sky
Gang Garrison 2
o source code
Kiloblaster*
Kobo Deluxe
KOPS*
Liero
M.A.R.S.
OpenLieroX
Phavon
Powermanga
Project: Starfighter
Protostriker M
o source code
Return of Dr. Destructo
SDL Sopwith
SHMUP - AirWars
Solar Wolf
Triplane Turmoil*
o Triplane Classic
Tyrian/Tyrian 2000*
o OpenTyrian
Vacuum Magic
Violetland
Warlock's Gauntlet
XQuest/XQuest 2

Simulation
Flight
Combat Simulator Project
decopter [engine/SDK]
FlightGear
Fly! Legacy
Flying Guns [engine/SDK]
GL-117
Palomino
Slope Soaring Simulator
Thunder&Lightning

Managerial
FreeTrain
Lincity
LinCity-NG
Micropolis*
OpenCity
OpenTTD
Race Into Space*
Schiffbruch!
Simutrans
Skyscraper
Spice Trade

Space flight
Flight Commander [source code available upon request]
No Gravity
Oolite
Orxonox
Pioneer
Scum of the Universe
Space Combat
Starshatter: The Gathering Storm*
o source code
Strange Adventures in Infinite Space*
StarTrade
Vega Strike

Various vehicles
Danger from the Deep
Linwarrior 3D
Rigs of Rods

Sports
Slam Soccer 2006
Yoda Soccer

Third-Person Shooter
Dead Justice

Turn-Based Strategy
Advanced Strategic Command
The Battle for Wesnoth
FreeLords
GEMpire
LordsAWar!
M.A.X.R. (Mechanized Assault and eXploration Reloaded)
Turious
UFO: Alien Invasion
UFO2000
XConq

4X
Anacreon*
Antiquity
o binaries
o source code
C-evo
Classic Empire
Conquests
Free Conquest & Colonization of America
Free Mars
Freeciv
FreeCol
FreeOrion
Iron Seed*
Kingdoms
Star Control II*
Stars! Nova
Stellar Conquest III*
Thousand Parsec

Turn-Based Tactics
Arena
o binaries
o source v2.1
Crimson Fields
LGeneral
MegaMek
Open Panzer
OpenGeneral
Paybacktime 2*
Tanks of Freedom

[Blake00]

Hi MrFlibble! This is a great list..

 

I think you've covered most of these already but there might be a couple here you might want to add. Eg OpenRA is definitely the biggest one I didn't see in your list.

https://blakessanctum.wordpress.com/2018/06/02/amazing-free-open-source-hd-fan-remakes-sequels-spin-offs-of-great-classic-90s-games/

[MrFlibble]

I'm not sure but I think that when I originally compiled this list I excluded any third-party engine recreations for closed-source games (unless there's a free alternate set of game data that can be used instead of proprietary data, like with OpenTTD or M.A.X. Reloaded). So OpenRA does not qualify. (I also am personally not a fan of this project because it does not try to recreate game mechanics of C&C and instead does something of its own, just with C&C graphics).