Cross-Platform C++ 2D/3D game engine
An OpenGL RTS game engine written in C
A modern cross-platform low-level graphics library
Xash3D FWGS engine
Simple and light-weight 3D game engine
Zig game engine & graphics toolkit
Voxel game engine in C++ with OpenGL
GZDoom is a feature centric port for all Doom engine games
Vulkan renderer mod for Minecraft
UZDoom is a feature centric port for all Doom engine games
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A re-implementation of Freelancer
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
3D Engine c++
A completely free, open-source, 2D game engine
A Minecraft mod designed to improve frame rates
Improved Quake III Arena engine
A modular Common Lisp game engine
3D Procedural Game Engine Using OpenGL
aka ogre v2 - scene-oriented, flexible 3D C++ engine
Animation engine for explanatory math videos
Multi-Joint dynamics with Contact. A general purpose physics simulator
crossplatform multithreaded object-oriented render and audio engine
Simple DirectMedia Layer
SwiftShader is a high-performance CPU-based implementation