Ct.js is a desktop game engine that makes learning programming fun
Open source clone of the Age of Empires II engine
Voxel game engine in C++ with OpenGL
A multi core friendly rigid body physics and collision detection lib
Cross-platform game engine in Rust
Modified source engine (2017) developed by valve and leaked in 2020
A high speed C++17 Vulkan game engine
A lightweight HTML5 Game Engine
Java Client + JS/Canvas Server-Side System, with maintained Objects