An open source Minecraft reimplementation written from scratch
Dust3D is a cross-platform open-source 3D modeling software
3D Procedural Game Engine Using OpenGL
Voxel game engine in C++ with OpenGL
Multiplayer FPS game - Counter-Strike: Football
An unofficial rules engine for the world's greatest card game
Free and open source real-time strategy game
Android real-time display control software
A dead simple 2D game engine for Go
Open source software for live streaming and recording
Simple DirectMedia Layer
The HTML5 Creation Engine
Programming eXperience Toolkit
An easy to use 2D HTML5 game engine written in TypeScript
LayaAir is an open-source 2D/3D engine
Java library that enables cross-platform access to popular native APIs
The Arcade Learning Environment (ALE) -- a platform for AI research
A high performance and high compatibility 1.12.2/1.16.5/1.18.2 version
The Ren'Py Visual Novel Engine
Open source library for creative expression on the web, desktop, etc.
Original Xbox Emulator for Windows, macOS, and Linux
PlayStation 3 emulator and debugger
A cross-platform PSP emulator
Synchronize games from other platforms into your Steam library
A Native GOG and Epic Games Launcher for Linux, Windows and Mac