A game framework written with osu! in mind.
3D game engine/framework in C, with Luajit and Python bindings now
Svelto ECS C# Entity Component System
Multi-platform 2D and 3D game engine
Multi Theft Auto is a game engine
A game engine powered by python and panda3d
A fresh & lightweight javascript game engine
Open source library for creative expression on the web, desktop, etc.
Powerful, mature open-source cross-platform game engine for Python
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Xash3D FWGS engine
The HTML5 Creation Engine
Cross-platform 2D game engine focused on ultimate productivity
The game engine for everyone
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A .NET ascii/ansi console engine written in C# for MonoGame and XNA
A completely free, open-source, 2D game engine
Ct.js is a desktop game engine that makes learning programming fun
Full featured MUD server with all the trimmings.
Orx: Portable Game Engine
PyCAPGE - Python Classic Adventure Point and Click Game Engine
A cell-based puzzle game featuring classic and completely new puzzles
Rust library to create a Good Game Easily
Modified source engine (2017) developed by valve and leaked in 2020
Vivid3D is an open-source 3D engine with powerful 2D UI.