And another thing I work on in my spare time is open source development.
I’m currently helping on working on ruby bindings for SFML.
SFML (super fast multimedia library) is a library that abstracts out things like networking, graphics, and sound and is designed to be easy to use and fast. It outperforms SDL and in my opinion has a much better API. SFML can be used with C/C++ but you can use it with other languages via bindings.
One of the things I did to test the bindings is to write a simple game called Same Game. For the rules look here
This library can be useful for rapidly prototyping games in ruby.
Here is a download link if anyone is interested.