CTFs as you need them
Desktop/Android/HTML5/iOS Java game development framework
Unity3D Client And C# Server Framework
Gideros Release version
All-In-One program that combines multiple Fortnite Dev Account tools.
Game engine supporting many 3D/2D formats and graphic effects
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Modern 3D engine and IDE written using C# and C++.
Example code for creating a 2D platform game in Java.
Build Cross-platform Applications
3D .NET engine for Windows, Linux, Mac
A tool for editing OHRRPGCE RPG files
UtiliGame is a light-weight game engine written in Java.
AdventureMap peripherals for ComputerCraft
The classic intelligent role playing game
AMOS BASIC reimplementation in Java
Cross-platform 2D game engine
A 2D Java game engine
A generic C++ MUD server featuring a strategy-style hexagon map