One framework for creating powerful cross-platform games
lua dev plugin for unreal engine 4 or 5
Desktop/Android/HTML5/iOS Java game development framework
A simple and easy-to-use library to enjoy videogames programming
Unity3D Client And C# Server Framework
CTFs as you need them
Open game and rendering engine packed into a JavaScript framework
A game framework written with osu! in mind.
Gideros Release version
Self-hosted CMS platform based on the Laravel PHP Framework
Arianne is an engine to develop multiplayer online games like Stendhal
Vivid3D is a C++ IDE/3D engine, with python scripting.
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Amateur 3D Game Engine
Examples of procedural geometry for Unity3D C#
Orx: Portable Game Engine
OgreWin3D
Game engine supporting many 3D/2D formats and graphic effects
Molecular viewer and prototyping framework
Vivid3D is an open-source 3D engine with powerful 2D UI.
Updated emulator of Forgotten Realms: Unlimited Adventures
Java Settlers
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Modern 3D engine and IDE written using C# and C++.