Xash3D FWGS engine
Open source voxel game engine with support for survival and crafting
Open-source Android/Desktop remake of Civ V
Do virtual gear shifting (and more) in any rider app
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
A certain block game
Voxel game-creation platform with easy modding and game creation
A simple and easy-to-use library to enjoy videogames programming
An open source reimplementation of the Among Us Server
Home theater software and entertainment hub for digital media
One framework for creating powerful cross-platform games
Cocos simplifies game creation and distribution with Cocos Creator
RetroArch is a frontend for emulators, game engines and media players.
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Open source HTML5 game framework that offers WebGL and Canvas
Desktop/Android/HTML5/iOS Java game development framework
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Open source library for creative expression on the web, desktop, etc.
Cross-platform game engine in Rust
A dead simple 2D game engine for Go
Portable UCI- and XBoard-compatible chess engines.
GemRB is a portable open-source implementation of the Infinity Engine
GEDKeeper - opensource and crossplatform genealogy management program
3D modeler, 3D game maker, 3D demo maker
Platform independent browser based Str8ts solver