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Cross-platform game engine in Rust.
A powerful free cross-platform RTS game engine. - Report issues at https://springrts.com/mantis/
The multiplayer game engine
Terasology - open source voxel world
3D C++ Game Engine - yet another open source game engine
Improved version of the X-Ray Engine, the game engine used in the world-famous S.T.A.L.K.E.R. game series by GSC Game World. Join OpenXRay! ;)
The Atomic Game Engine is a multi-platform 2D and 3D engine with a consistent API in C++, C#, JavaScript, and TypeScript
fheroes2 is a recreation of Heroes of Might and Magic II game engine
Descent 3 by Outrage Entertainment
The ioquake3 community effort to continue supporting/developing id's Quake III Arena
An OpenGL RTS game engine written in C
Open source reimplementation of GTA San Andreas game engine in Unity
3D game engine with lua scripting
Community effort to maintain and improve Jedi Academy (SP & MP) + Jedi Outcast (SP only) released by Raven Software
OpenRW "Open ReWrite" is an un-official open source recreation of the classic Grand Theft Auto III game executable
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Python MUD/MUX/MUSH/MU* development system
A game framework written with osu! in mind.
Multi Theft Auto is a game engine that turns Grand Theft Auto: San Andreas into networked multiplayer.
Esoterica Engine
Pixel Vision 8's core philosophy is to teach retro game development with streamlined workflows. PV8 is also a platform that standardizes 8-bit fantasy console limitations built on top of the open-source C# game engine based on MonoGame.
OpenSAGE is a free, open source re-implementation of SAGE, the 3D real time strategy (RTS) engine used in Command & Conquer: Generals and other RTS titles from EA Pacific. Written in C#. Not affiliated with EA.
An open-source fighting game engine that supports MUGEN resources.
Axmol Engine – A Multi-platform Engine for Desktop, XBOX (UWP), WebAssembly and Mobile games.
a 2D Game Development Framework
GemRB is a portable open-source implementation of Bioware’s Infinity Engine.
C++ open source 3D game engine
Nebula is an open-source and free-to-use modern C++ game engine.
A modern re-implementation of the classic DOS game Duke Nukem II
Lina Engine is an open-source , modular, tiny and fast C++ game engine, aimed to develop 3D desktop games.