Cocos simplifies game creation and distribution with Cocos Creator
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Free, cross-platform 2D game engine powered by Haxe and OpenFL
A completely free, open-source, 2D game engine
Cross-platform game engine in Rust
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
Full featured MUD server with all the trimmings.
JavaScript-based game engine designed to empower developers
All-in-one game engine built on Godot. Roblox & UEFN alternative
An open source re-implementation of Diablo 2
2D Game Engine with Lua Scripting made on top of SFML
Low-Level Game Engine for Retro Platforms
scriptable game engine with built-in support for 2D graphics and sound
The Atomic Game Engine is a multi-platform 2D and 3D engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Modern AS3 Game Engine
Turbulenz is a modular 3D and 2D game framework
Cross-platform 2D gaming middleware