Cross-platform 2D and 3D game engine with modular architecture
Free game engine for development of desktop, mobile, and web games
The Tiny JavaScript Game Engine That Can!
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Ct.js is a desktop game engine that makes learning programming fun
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
A completely free, open-source, 2D game engine
JavaScript-based game engine designed to empower developers
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Amazon Lumberyard is a free AAA game engine
2D Game Engine with Lua Scripting made on top of SFML
Web powered cross-platform 3D, WebXR game engine
Modern AS3 Game Engine