Free game engine for development of desktop, mobile, and web games
Cross-platform 2D and 3D game engine with modular architecture
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Open source library for creative expression on the web, desktop, etc.
Stride (formerly Xenko), a free and open-source cross-platform C# game
Zig game engine & graphics toolkit
SDL based generic 2D game engine
PyCAPGE - Python Classic Adventure Point and Click Game Engine
A completely free, open-source, 2D game engine
2D Game Engine with Lua Scripting made on top of SFML
Web powered cross-platform 3D, WebXR game engine
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
A free ActionScript 3 library designed for developing 2D Flash games