Desktop/Android/HTML5/iOS Java game development framework
A game framework written with osu! in mind.
Unity3D Client And C# Server Framework
All-In-One program that combines multiple Fortnite Dev Account tools.
Event driven concurrent framework for Python
Create symmetric sprites: browse, save to PC, or store online
Java decentralized cross-platform network multiplayer game engine
A generic 2D engine for any kind of game
Java Gamepad API for multiple platforms
A 3D, fully concurrent game engine
A multiplatform game engine for interactive fiction experiences
An open source skateboard games engine written in C# and .NET.
Pear3DEngine is a modern and modular 3D development framework
Game framework on top of Python, Panda3D and Twisted
Zap Engine