You can make it - Open Source MMORPG Platform
lua dev plugin for unreal engine 4 or 5
All-In-One program that combines multiple Fortnite Dev Account tools.
Game engine supporting many 3D/2D formats and graphic effects
Example code for creating a 2D platform game in Java.
A generic 2D engine for any kind of game
Kinect based controller.
A retro style video game engine for RPGs and adventure games.
Hungry Hero is an open source Flash game built on Starling Framework.
A lightweight HTML5 Game Engine
UtiliGame is a light-weight game engine written in Java.