scene-oriented, flexible 3D engine (C++, Python, C#, Java)
2D JavaScript Physics Engine
3D Procedural Game Engine Using OpenGL
High performance UI layout library in C
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
Zig game engine & graphics toolkit
Cross-platform game engine in Rust
Full featured MUD server with all the trimmings.
Amateur 3D Game Engine
Game engine supporting many 3D/2D formats and graphic effects
Here we're trying to create the easiest open-source game engine.
Orx: Portable 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.
Urho3D Game engine
Mini game engine for games104
Entitas is a super fast Entity Component System (ECS) Framework
A cross-platform, open-source, pure C game engine for mobile game
Engo is an open-source 2D game engine written in Go
Retro game engine for creating games like it's 1997
A fork of dhewm3 with an emphasis on modernisation and vanilla Doom 3
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.