Godot is a powerful cross-platform game engine
Xash3D FWGS engine
Cocos simplifies game creation and distribution with Cocos Creator
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Cross-platform game engine in Rust
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
One framework for creating powerful cross-platform games
Desktop/Android/HTML5/iOS Java game development framework
RetroArch is a frontend for emulators, game engines and media players.
Open source library for creative expression on the web, desktop, etc.
The game engine for everyone
Do virtual gear shifting (and more) in any rider app
A dead simple 2D game engine for Go
Action-adventure game originally released in 2013
3D Engine c++
JavaScript framework to build game engines, games, emulators and apps
3D modeler, 3D game maker, 3D demo maker
2D Game Engine
Cross-platform 2D and 3D game engine
Character animation system for games and simulations.
A cross-platform interpreter for many point-and-click adventure games
The Atomic Game Engine is a multi-platform 2D and 3D engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
3D .NET engine for Windows, Linux, Mac