Open Source Game Clones

This site tries to gather open-source reimplementations of great old games in one place. Now it is very simple and if you think that some information is missing or have any suggestions - feel free to contact me by e-mail.

Hence all these projects are open-source you can help them and make this world a better place. Or at least you can play something to appreciate the effort people put in them.

All games that were added in last month are highlighted as this paragraph.

List of complete clones

Some of these games aren't reimplementations but evolution of original ones, which were eventually open sourced.

SCUMM: ▶ ScummVM - very active development, C++. List of supported games is here (repository).
Baldur's Gate series
Icewind Dale series
Planescape: Torment: ▶ GemRB - active development, C++ (repository).
Carmageddon: ▶ OpenC1 - moderately active development, C# (repository).
Clonk: ▶ OpenClonk - active development, C++ (repository).
Colonization: ▶ FreeCol - active development, Java (repository).
Commander Keen Series: ▶ Commander Genius - active development, C++ (repository).
Command & Conquer
Command & Conquer: Red Alert: ▶ OpenRA - active development, C# (repository).
Descent
Descent 2: ▶ D2X - active development, C++ (repository).; ▶ DXX-Rebirth - active development, C (repository).
Doom
Doom II
Heretic
Hexen: ▶ Doomsday - active development, C (repository).; ▶ Chocolate Doom - active development, C (repository).; ▶ ZDoom - active development, C (repository).; ▶ PrBoom+ - active development, C (repository).; ▶ Odamex - active development, C (repository).
Duke Nukem 3D: ▶ EDuke32 - active development, C (repository).
Dune 2: ▶ Dune Legacy - active development, C++ (repository).; ▶ OpenDUNE - active development, C (repository).
Dungeon Keeper: ▶ KeeperFX - active development, C (repository).
Flashback: ▶ Reminiscence - moderately active development.
FreeSpace 2: ▶ FreeSpace Source Code Project - active development, C++ (repository).
Gladiator: ▶ Openglad - development halted, C++ (repository).
Heroes of Might and Magic II: ▶ fheroes2 - active development, C++ (repository).
Heroes of Might and Magic III: ▶ VCMI - active development, time-based releases, C++ (repository).
Homeworld: ▶ Homeworld SDL - development halted, playable (repository).
Knights and Merchants: ▶ KaM Remake - active development, Delphi (repository).
Lemmings: ▶ Pingus - active development, C++ (repository).
Liero: ▶ OpenLiero - development halted, C++ (repository).; ▶ OpenLieroX - active development, C++ (repository).
Quake 3: ▶ ioquake3 - active development, C (repository).; ▶ OpenArena - sporadical development, C (repository).
Marathon
Marathon 2
Marathon Inifinity: ▶ Aleph One - active development, C++ (repository).
Mario World: ▶ Secret Maryo Chronicles - active development, C++ (repository).
Master of Orion 2: ▶ OpenMOO2 - moderately active development, Python (repository).
M.A.X.: ▶ Mechanized Assault and eXploration Reloaded - moderately active development, C++ (repository).
Morrowind: ▶ OpenMW - active development, C++ (repository).
Paradroid: ▶ FreedroidClassic - development completed, C.
Seven Kingdoms: ▶ Seven Kingdoms: Ancient Adversaries - active development, C++ (repository).
Silent Hunter 4: ▶ Danger from the Deep - sporadical development, C++ (repository).
Star Control 2: ▶ The Ur-Quan Masters - active development, C (repository).
Stunts: ▶ Ultimate Stunts - moderately active development, C++ (repository).
Syndicate: ▶ FreeSynd - active development, C++ (repository).
The Settlers: ▶ Freeserf - sporadical development, C (repository).
The Settlers II: ▶ Return to the Roots - active development, C++ (repository).
Theme Hospital: ▶ CorsixTH - active development, time-based releases, C++ (repository).
Total Annihilation: ▶ Spring - active development, C++, Java, Python (repository).; ▶ Total Annihilation 3D - moderately active development, C++ (repository).
Transport Tycoon
Transport Tycoon Deluxe: ▶ OpenTTD - active development, C++ (repository).
Tyrian: ▶ OpenTyrian - moderately active development, C (repository).
Ultima IV: ▶ xu4 - active development, C++ (repository).
Ultima VI
The Savage Empire
Martian Dreams: ▶ Nuvie - active development, C++ (repository).
Ultima VII: ▶ Exult - moderately active development, C++ (repository).
Ultima VIII: ▶ Pentagram - sporadical development, C++ (repository).
Warzone 2100: ▶ Warzone 2100 - active development, C++ (repository).
Wing Commander: Privateer: ▶ Privateer - Gemini Gold - moderately active development, C++ (repository).
X-COM: UFO Defence
UFO: Enemy Unknown: ▶ OpenXcom - active development, C++ (repository).
Z: ▶ The Zod Engine - active development (repository).

Inspired by original game series

Age of Empires: ▶ 0 A.D. - active development, C++ (repository).
Anno series: ▶ Unknown Horizons - active development, Python (repository).
Battle Zone: ▶ BZFlag - active development, C++ (repository).
Civilization II: ▶ FreeCiv - active development, C (repository).; ▶ Freeciv.net - active development, online browser game, C, Java, JavaScript (repository).
Diablo: ▶ Summoning Wars - active development, C++, Lua (repository).; ▶ FreedroidRPG - active development, C, Lua, Python (repository).; ▶ Flare - active development, C++ (repository).
Dungeon Keeper: ▶ OpenDungeons - active development, C++ (repository).
Elite: ▶ Oolite - active development (repository).
Escape Velocity: ▶ Naev - active development, C (repository).
Master of Orion Series: ▶ FreeOrion - moderately active development, C++ (repository).
Microsoft Flight Simulator: ▶ FlightGear - active development, C++ (repository).
Simcity: ▶ LinCity - moderately active development, C++ (repository).
The Settlers
The Settlers II: ▶ Widelands - active development, C++, Lua, Python (repository).
Sonic the Hedgehog: ▶ Open Surge - active development, C (repository).
Transport Tycoon Deluxe: ▶ Simutrans - active development, C++ (repository).
Worms Series: ▶ Hedgewars - active development, Pascal (repository).; ▶ WarMUX - active development, C++ (repository).
X-COM Series: ▶ UFO: Alien Invasion - active development, C (repository).