Godot is a powerful cross-platform game engine
A cross-platform PSP emulator
Open source cross-platform multi-purpose game toolkit
Xash3D FWGS engine
Voxel game-creation platform with easy modding and game creation
UCI chess engine
Stream switch games to your PC via USB or network
Desktop/Android/HTML5/iOS Java game development framework
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
One framework for creating powerful cross-platform games
A certain block game
A simple and easy-to-use library to enjoy videogames programming
RetroArch is a frontend for emulators, game engines and media players.
Cocos simplifies game creation and distribution with Cocos Creator
Open-source Android/Desktop remake of Civ V
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Cross-platform game engine in Rust
The game engine for everyone
Open source library for creative expression on the web, desktop, etc.
Do virtual gear shifting (and more) in any rider app
A dead simple 2D game engine for Go
Multi-platform 2D and 3D game engine
Action-adventure game originally released in 2013
Portable UCI- and XBoard-compatible chess engines.
3D Engine c++