Ask HN: Learn Ruby by Reading Source Code

I'm learning Ruby and I was looking for some excellent open source code to read.

I'm already writing some code (following tutorials, etc.) but I would love to see some real world examples. I would like it to be simple enough for a beginner to follow along, while demonstrating the best practices for the language.

Thanks for your time and if you have any other suggestions to improve my skills with Ruby, I'm definitely open to hearing them.