Game Remakes
Actively maintained open-source game remakes.
Action
Reimplementation of Grand Theft Auto.
Reimplementation of The Simpsons: Hit & Run in modern C++ and modern OpenGL.
Community effort to maintain and improve Jedi Academy and Jedi Outcast by Raven Software.
Classic Tomb Raider open-source engine.
Role-playing game engine for Taleworlds' Mount&Blade Series.
Reverse engineering of Magic Carpet 2 from Assembler.
Modern reimplementation of the classic DOS game Duke Nukem II in C++.
Reimplementation of GTA: San Andreas game engine in Unity.
Tomb Raider: Chronicles disassembly translated to C source code.
Open source implementation of the classic Tomb Raider I game.
Heretic II (1998, Raven Software) reverse-engineered source port.
Adventure
A remake of the original C64 classic The Detective Game for Nintendo DS.
Allows you to run certain classic graphical point-and-click adventure games such Maniac Mansion and Monkey Island.
A Little Big Adventure 2 / Twinsen's Odyssey reimplementation in JavaScript / Three.js / React.
TwinEngine: a Little Big Adventure engine.
Time Commando Reimplementation
Little Big Adventure: Twinsen's Adventure Definitive Edition
Little Big Adventure 2 engine source code.
Arcade
Remake of classic Atari 2600 game "Acid Drop".
Classic overhead run-and-gun game.
Faithful from-scratch rewrite of the twin-stick shooter Crimsonland.
8-player Bomberman clone for RetroArch/Libretro.
Multiplayer action game where you control small and nimble humanoids.
Free, open-source version of the classic Jazz Jackrabbit games.
Rewriting attempt of the cult football game Kick Off 2.
One Must Fall 2097 Remake.
An open-source port of Tyrian from Turbo Pascal to C.
C++ retro arcade remakes showcasing clean OOP design, game loops, collision systems, and state management.
2D Asteroids Style Game using MX2.
Fan-made, open-source clone of the Touhou series.
Classic ZX Spectrum game The Great Escape in portable C.
A game and editing tool that lets you create custom Legend of Zelda quests.
Warhawk DS remake of the C64 game Warhawk to the Nintendo DS in native assembler.
FPS
The open source continuation of Bungie’s Marathon 2 game engine.
Allegiance is RTS and FPS Space Combat game.
Ace Of Spades open source implementation that runs on older machines.
Advanced and featureful Rise of the Triad source port for modern systems.
A source port of Blake Stone: Aliens Of Gold and Blake Stone: Planet Strike.
Windows source port of Catacomb 3D and the Catacomb Adventure series.
"PanzerChasm" is a free recreation of the game "Chash: - The Rift" by "ActionForms" using the original game data (CSM.BIN file).
Source port that is minimalist, historically accurate and includes ports of Heretic and Hexen, and Strife.
A purist Quake source port that restores the original look and feel of v1.09 and earlier.
Minecraft Classic compatible client written in C from scratch.
A limit-removing enhanced-resolution Doom source port based on Chocolate Doom.
A source port of Doom 3.
fork of the Doom 64 EX+ engine, Its main goal is to show what the Doom 64 engine would have looked like if it hadn't been limited by the N64 console.
Classic, refined DOOM source port for Windows PC.
Source port of id Software's DOOM I/II and Raven Software's Heretic and Hexen.
A successor of prboom+ with extra tooling for demo recording and playback, with a focus on speedrunning and quality of life.
Cross-Platform OpenGL Doom Source Port with powerful modding features.
Combining the features of all modern QuakeWorld clients, ezQuake makes QuakeWorld easier to start and play.
Free software FPS based on the classic DOOM engine.
DOOM III/Quake 4/Prey(2006) GLES on Android/Windows/Linux, DOOM 3 BFG/The Dark Mod/RTCW/Quake 1 2 3/GZDOOM/ETW/RealRTCW/OpenJK/SeriousSam/Skin Deep on Android.
The free software FPS engine that can be used to play Quake 3, or make your own game.
Source port of Return to Castle Wolfenstein.
High-performance QuakeSpasm fork.
Port of the 3D Realms game "Shadow Warrior".
No-promises port of the Capstone Software game "TekWar".
No-promises port of the Capstone Software game "Witchaven".
Port of the classic FPS Blood.
A Linux port of Far Cry 1.
Free software reconstruction of Chasm: The Rift game.
Online multiplayer DOOM port with a strong focus on the original gameplay while providing a breadth of enhancements.
Open re-implementation of Medal of Honor: Allied Assault including Spearhead and Breakthrough expansions.
Compatible client of Ace of Spades, a voxel FPS.
Improved Quake III Arena engine.
Build engine port backed by GZDoom tech. Currently supports Duke Nukem 3D, Blood, Shadow Warrior, Redneck Rampage and Powerslave/Exhumed.
Doom 3 BFG Edition with soft shadows, cleaned up source, Linux and 64 bit Support.
Open source game engine for Serious Sam Classic with Vulkan support.
Serious Sam Alpha Remake open source project based.
The goal of this project is to reimplement enough of the original Unreal Engine to make the Unreal Tournament (UT99) maps playable.
SDL2 port of Rise of the Triad.
Advanced DOOM source port.
Jedi Engine for modern systems and the games that used that engine - Dark Forces and Outlaws.
Libretro port of Tyrquake.
Modder-friendly OpenGL and Vulkan source port based on the DOOM engine.
Vulkan Quake port based on QuakeSpasm.
Enhanced client for id Software's Quake II with focus on offline and coop gameplay.
Cross-Platform OpenGL Doom Source Port with powerful modding features.
QuakeForge is descended from the original Quake engine as released by Id Software in December 1999, and can be used to play original Quake and QuakeWorld games and mods (including many modern mods).
Port of Redneck Rampage.
Online
A 2006 RuneScape 2 Emulation Server.
Reimplementation of The Sims Online, targetted mainly at mobile devices.
The first 3D MMORPG, released in 1996 and open sourced in 2012. The original codebase for Meridian 59.
Rewrite of the RuneScape Classic (2001-2003) game client in portable C.
Open source Old School RuneScape (OSRS) client.
Ryzom Core contains the whole code (client, server, tools) used to make the commercial MMORPG Ryzom.
Space Station 14 is a revived attempt at a Space Station 13 remake.
RPG
Abyss Engine is a game engine designed to run games similar to 2000's style ARPGs such as Diablo II.
Cross-platform port of Arx Fatalis, a first-person role-playing game.
Open source release of Barony.
An open source implementation of the Bard's Tale Construction Set.
Recreation of Daggerfall in the Unity engine.
Reconstructed form of Diablo's original source code.
Diablo build for modern operating systems.
Implementation of the Diablo game engine.
Project to recreate Ultima 7 for modern operating systems.
Crossplatform Fallout 2 game engine writen in C++ and SDL.
Open-source implementation of the Diablo engine.
Real-time, isometric action game engine inspired by Fallout Tactics.
Portable open-source reimplementation of the Infinity Engine (used by Baldur's Gate, Icewind Dale and more).
Might and Magic VI-VIII engine remake using original data & code.
Reimplementation of Gothic 2: Night of the Raven.
Reimplementation of the Morrowind game engine.
Collaboration project extending the Nox engine.
Modern engine reimplementation of The Elder Scrolls: Arena by Bethesda Softworks.
Final Fantasy VIII engine implementation in C#.
An open source reimplementation of zEngine the engine behind Gothic and Gothic II.
Diablo II remade using Java and LibGDX.
A set of engine modifications for the classic game Fallout 2.
Same great System Shock, new great taste.
Remake of 1995 Albion.
An engine recreation of Ultima Underworld and Ultima Underworld 2 in the Godot Engine.
This is a reverse engineered clone of Zelda 3 - A Link to the Past.
Reimplementation of the original Zork game developed by Infocom.
Implementation of BioWare's Aurora engine and its derivatives (used by Neverwinter Nights, The Witcher and more).
Platformer
Reimplementation of Oddworld: Abe's Exoddus.
PC Port of Banjo-Kazooie made using N64: Recompiled.
Super Mario 64 reimplementation for PC.
Reimplementation of Jazz Jackrabbit 2.
Java remake of Lionheart Amiga game.
A re-working of Manic Miner onto the DS using levels created for other official computer released versions.
Rewrite of the masterpiece jump-and-run platformer Doukutsu Monogatari (also known as Cave Story).
Reimplementation of Commander Keen in Goodbye Galaxy.
Monogame implementation of Prince of Persia 2.
Port of Prince of Persia, based on the disassembly of the DOS version.
Super Mario 64 reimplementation in JavaScript.
Adaptation of Secret Mario Chronicles.
An unofficial PC port of the Xbox 360 version of Sonic Unleashed created through the process of static recompilation.
The source code to VVVVVV.
The project's goal is to port the original trilogy (Jak 1 -> Jak 3) to PC.
Racing
A work-in-progress open source reimplementation of Burnout 3: Takedown.
Open Source Engine / Death Rally [1996]
Death Rally engine reimplementation.
Reverse engineering the 1997 game "Carmageddon"
Hi-Octane with level editor using Irrlicht engine.
Tools to inspect and modify levels of the game Hi-Octane by Bullfrog (1995).
Attempt to recreate the classic Need for Speed Games (1-6).
64-bit vesion of DOS game Tube (Bullfrog, 1994)
Racing/RPG hybrid made open-source by its creators, written in C++.
The idea of this project is to replicate the old look and behavior of Vangers, but with native hardware acceleration for the graphics.
This is a re-implementation of the 1995 PSX game wipEout.
Reverse engineered Hard Truck Apocalypse.
Interstate '76 engine reimplementation
Reimplementation of Mario Kart 64 for PC.
Simulator
Descent 3 by Outrage Entertainment
Source port of the Descent and Descent 2 Engines for Windows, macOS, Linux.
FreeSpace2 Source Code Project.
Reimplementation of the 2003 space game Freelancer.
Descent 3 by Outrage Entertainment
Descent 1&2 VR source port based on DXX-Retro
Forsaken game engine.
The Forsaken source code.
Strategy
Spiritual successor to Heroes of Might and Magic III focusing on combat; matched based eSport.
Remake of Ares, a tactical space combat game.
Implementation of Sid Meier's Civilization.
Open-source Android/Desktop remake of Civ V.
OpenCiv3 is an open-source, cross-platform, mod-oriented, modernized remake of Civilization III by the fan community built with the Godot Engine and C#.
Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization.
Freecivworld.net is the 3D version of Freeciv.
Clone of Theme Hospital with support for modern operating systems, high resolutions and much more.
Community-driven effort to continue the development of Cortex Command.
Free implementation of Heroes of Might and Magic II game engine.
Dungeon Keeper II partial recompilation with bug fixes.
Unofficial open-source OpenGL/SDL2 reimplementation of Sid Meier's Alpha Centauri ( + Alien Crossfire ).
Makes Jagged Alliance 2 available on a wide range of platforms.
Reimplementation of Caesar III.
RTS game remake of Knights and Merchants written in Delphi from scratch.
Open source remake and Fan Expansion of Dungeon Keeper.
Roguelike dungeon builder inspired by Dwarf Fortress.
A turn based strategy game.
Mech Commander 2 open source engine + OpenGL Linux port.
MegaGlest real-time strategy game engine (cross-platform, 3-d).
Clone of the Age of Empires II engine.
Rebuild of the X-COM: Apocalypse engine.
Reimplementation of Black & White.
Open source game inspired by Dungeon Keeper - Dark, damp and dangerous...
Remake of Earth 2140 based on the OpenRA engine
Recreation of the popular game Dune II.
Open-source implementation of Cannon Fodder.
Remake of Sierra On-Line's Outpost.
Open-source implementation of Hard Vacuum.
Remake of KKnD (Krush, Kill 'n' Destroy) and KKnD2 based on the OpenRA engine
Reimplementation of Chris Sawyer's Locomotion.
HTML5 Panzer General 2.
Implementation of the Red Alert engine using .NET/mono and OpenGL. Runs on Windows, Linux and macOS.
OCC is an unofficial open source engine reimplementation of the game trilogy Crystal Caves.
Recreation of RollerCoaster Tycoon 2.
Remake of Swarm Assault based on the OpenRA engine
C# reimplementation of SAGE, the game engine used by a bunch of EA Pacific games, including Command & Conquer: Generals and Battle for Middle Earth.
Remake of SimCity 2000 by Maxis.
An open-source re-implementation of Bullfrog's Sim Theme Park / Theme Park World (1999).
OpenTTD is a transport simulation game based upon the popular game Transport Tycoon Deluxe, written by Chris Sawyer.
Clone of UFO: Enemy Unknown and X-COM: Terror From the Deep.
An open source re-implementation of Pharaoh in the Julius/Augustus engine.
Version of Interplay's Buzz Aldrin's Race into Space.
Settlers II remake written in C++.
Remake of C&C Tiberian Sun based on the OpenRA engine
Simutrans is a freeware and open-source transportation simulator.
Syndicate Wars Fan Expansion, Open Source remake of the classic Bullfrog game.
Remake of C&C Red Alert 2 based on the OpenRA engine
Implementation of Stronghold by Firefly Studios.
A real-time strategy game made with LÖVE based on the original Stronghold by Firefly studios.
Command and Conquer and Red Alert original release source port based on the remaster source code drop.
Engine for Heroes of Might and Magic III.
Warcraft 2 Mod that allows you to play Warcraft 2 with the Stratagus engine.
Free and open-source real time strategy game.