Free game engine for development of desktop, mobile, and web games
JavaScript-based game engine designed to empower developers
Cross-platform 2D and 3D game engine with modular architecture
A completely free, open-source, 2D game engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Stride (formerly Xenko), a free and open-source cross-platform C# game
Open source library for creative expression on the web, desktop, etc.
Python MUD/MUX/MUSH/MU* development system
Zig game engine & graphics toolkit
SDL based generic 2D game engine
PyCAPGE - Python Classic Adventure Point and Click 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
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
XNA based game engine completely written in c#
A free ActionScript 3 library designed for developing 2D Flash games