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Gosu is a 2D game development library for the Ruby and C++ programming languages, available for Mac OS X, Windows, and Linux (including Raspbian). The C++ version is also available for iPad, iPhone, and iPod Touch. In addition, you can find a RubyMotion compatible version here.
The C++ version of Gosu is only compatible with Visual C++ 2015 when used on Windows.

Gosu provides basic building blocks for games:

a window with a main loop and callbacks
2D graphics and text, accelerated by 3D hardware
sound samples and music in various formats
keyboard, mouse, and gamepad input

The extended Ruby/Gosu gem family:

gem install gosu
precompiled for Windows (Ruby 1.8 through 2.2), OS X users see here, Linux users see here
gem install releasy
automatically distribute any Ruby game as a Windows executable or Mac app, by Spooner
gem install texplay
pixel-based drawing on Gosu images, by banister
gem install ashton
a C extension that integrates GL shaders and a particle engine with Gosu, also by Spooner
gem install gamebox
a complete game framework based on Gosu, by shawn42
gem install chingu
a library that adds more game logic, by ippa (not maintained anymore)
gem install chipmunk
a popular physics library with an integration example in the wiki
gem install opengl
the standard Ruby OpenGL gem works fine with Gosu to add 3D effects
(See the included example, or this fine bundle of tutorials by tjbladez.
gem install rmagick
a more powerful but harder-to-distribute alternative to TexPlay, example included with Gosu

There is also an experimental TextMate bundle that makes Ruby/Gosu easier to use. It is generated from the rdoc every night. The best way to understand what it can do for you is to inspect it in the bundle editor.

Licensing