lua dev plugin for unreal engine 4 or 5
One framework for creating powerful cross-platform games
A simple and easy-to-use library to enjoy videogames programming
Desktop/Android/HTML5/iOS Java game development framework
Gideros Release version
A game framework written with osu! in mind.
Self-hosted CMS platform based on the Laravel PHP Framework
Amateur 3D Game Engine
Game engine supporting many 3D/2D formats and graphic effects
A complete 2D/3D Arcade Game Engine for Browser (Blender compatible)
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.
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++.
8-bit Graphical API for Java
Source code of the chapters of the book 3D Game Development with LWJGL
Example code for creating a 2D platform game in Java.
2D ARPG Engine
3D .NET engine for Windows, Linux, Mac
Open Game Bootstrap