LWJGL is a Java library that enables cross-platform access to popular native APIs useful in the development of graphics (OpenGL, Vulkan, bgfx), audio (OpenAL, Opus), parallel computing (OpenCL, CUDA) and XR (OpenVR, LibOVR, OpenXR) applications.

The high-speed OpenGL, OpenCL, OpenAL, OpenXR, GLFW, SDL, Vulkan, Assimp, WebGPU, and DirectX bindings library your mother warned you about.

The Open Toolkit library is a fast, low-level C# wrapper for OpenGL, OpenAL & OpenCL. It also includes windowing, mouse, keyboard and joystick input and a robust and fast math library, giving you everything you need to write your own renderer or game engine. OpenTK can be used standalone or inside a GUI on Windows, Linux, Mac.

KlayGE is a cross-platform open source game engine with plugin-based architecture.

C++ game engine for Windows, macOS, Linux, iOS, tvOS, Android, and web browsers

Note: development continues in stuntrally3. 3D racing game based on VDrift and OGRE with own Track Editor. The main repository with Stunt Rally 2.x sources and data.

3D FPS game engine with full dynamic lighting and shadows

A libretro frontend written in golang

An Open-Source port of the 1999 Game "Star Wars Episode 1: Racer"

The Dæmon game engine. With some bits of ioq3 and XreaL.

A spare-time C# .NET 8 game engine project. Cross-platform, multi-threaded.

BetterSpades, an Ace of Spades client targeted at low end systems (GL/ES 1.1). Runs on your grandmother's rig!

Lightweight game engine.

Easy to use cross-platform 2D game library for C++

An advanced C++ 3D game engine powering an in-production game yet to be announced

Audio playback/capturing engine for C#

Binary Tetris

An SDL2-based implementation of OpenAL in a single C file.

Cross-platform gaming kit in the D programming language

A SoundFont MIDI synthesizer for .NET