Unity3D Client And C# Server Framework
One framework for creating powerful cross-platform games
A simple and easy-to-use library to enjoy videogames programming
lua dev plugin for unreal engine 4 or 5
Desktop/Android/HTML5/iOS Java game development framework
Open Source MMORPG Framework
Open game and rendering engine packed into a JavaScript framework
Gideros Release version
CTFs as you need them
Self-hosted CMS platform based on the Laravel PHP Framework
A game framework written with osu! in mind.
You can make it - Open Source MMORPG Platform
Arianne is an engine to develop multiplayer online games like Stendhal
Amateur 3D Game Engine
Reusable code for building video games with Jogamp NEWT
JavaScript framework to build game engines, games, emulators and apps
A simple cross-platform game engine for creating old-school 2D games
Examples of procedural geometry for Unity3D C#
Game engine supporting many 3D/2D formats and graphic effects
OgreWin3D
Orx: Portable Game Engine
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Molecular viewer and prototyping framework
Vivid3D is an open-source 3D engine with powerful 2D UI.