The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
Recreation of the classic Grand Theft Auto III game executable
Cross-platform game engine in Rust
The ioquake3 community effort to continue supporting/developing id's
Zig game engine & graphics toolkit
The HTML5 Creation Engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
High performance UI layout library in C
2D JavaScript Physics Engine
Game engine supporting many 3D/2D formats and graphic effects
Free, open source game engine online
Orx: Portable Game Engine
A simple cross-platform game engine for creating old-school 2D games
Amateur 3D Game Engine
Here we're trying to create the easiest open-source game engine.
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Haskell game engine library for roguelike dungeon crawlers
Modified source engine (2017) developed by valve and leaked in 2020
The multiplayer game engine
Vivid3D is an open-source 3D engine with powerful 2D UI.
Entitas is a super fast Entity Component System (ECS) Framework
Urho3D Game engine
A cross-platform, open-source, pure C game engine for mobile game
Mini game engine for games104
Open source reimplementation of GTA San Andreas game engine in Unity