Gosu
Gosu is a 2D game development library for the Ruby and C++ programming languages, available for Mac OS X, Windows, and Linux.
10 Alternatives To Gosu
Adventure Game Studio
Adventure Game Studio provides the tools to make your own adventure, for free!
AppGameKit
AppGameKit is a game development platform for mobile devices.
BYOND
BYOND is the premier community for making and playing online multiplayer games.
Blacksmith 2D
Black is a highly optimized 2D framework for web, mobile games, and playable ads.
FlatRedBall
Cross-platofrm 2D game engine using C#, focused on developer productivity, transparency, scalability, and ease of use.
HaxeFlixel
Create cross-platform games easier and free. All with one codebase.
LITIengine
LITIengine is a free and open source Java 2D Game Engine. It provides all the infrastructure to create tile based 2D games with plain java, be it a platformer or a top-down adventure.
MonoGame
MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
RPG Maker
Make your own PC game with RPG Maker. Our easy to use tools are simple enough for a child, and powerful enough for a developer. Try it free today!