Mage

Open-source, cross-platform 2D/3D/multiplayer game engine designed for everyone.

Desktop/Android/HTML5/iOS Java game development framework

Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL.

A dead simple 2D game engine for Go

A Flutter based game engine.

Unity3D Client And C# Server Framework