I've been using ruby on rails for the last 4 months or so and I've been really enjoying the whole concept of open source. I know it's not exclusive to ruby/rails but coming from windows programming this is my first real exposure to it.

I want to "give back" what I can but I don't feel like I can contribute any worthwhile open source projects or gems of my own. So I figured a good place to start is by documenting or writing tests for some existing projects.

Could you guys please point me to a few possible options? I'd prefer projects that are pretty active but at the same time not too complex (since I'm not very good with ruby right now).

This might be a subjective question but at this point I have no idea where to even start. So even subjective answers would be much appreciated.