Godot is a powerful cross-platform game engine
Desktop/Android/HTML5/iOS Java game development framework
Open source HTML5 game framework that offers WebGL and Canvas
Open source library for creative expression on the web, desktop, etc.
One framework for creating powerful cross-platform games
A simple and easy-to-use library to enjoy videogames programming
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
Orx: Data-Driven Game Engine
Cinema Enters Game Console
Cross-platform 2D and 3D game engine
Reactive extensions for Unity
Open-source, cross-platform, C++ game engine for creating 2D/3D games
3D .NET engine for Windows, Linux, Mac
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Hungry Hero is an open source Flash game built on Starling Framework.
Cross-platform 2D game engine