You can make it - Open Source MMORPG Platform
A simple and easy-to-use library to enjoy videogames programming
Desktop/Android/HTML5/iOS Java game development framework
Gideros Release version
All-In-One program that combines multiple Fortnite Dev Account tools.
ReShade is a generic post-processing injector for games and videos.
A real-time game development platform
Asphyre is a cross-platform framework for Delphi and FreePascal.
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Open Game Bootstrap
An advanced flexible game engine for Java.
Cross-platform C framework very compact libraries and tools.
Create your own animated characters for games with ease!
An extensible development framework for roleplay games.
Open Source Virtual World and MMOG Development Platform
easy programming language for cross-platform 2d games
Delphi-like IDE for cross-platform game development