Great idea, I have a ton of one-off side projects I'd love to share (and get some awesome hacker critique as well)

I've written a simple ruby worker management "framework" known as theman, which is a thin wrapper atop rufus-scheduler and god: http://github.com/jcapote/theman

Also, there's fieldy, a simple fixed-width field reader/writer library for ruby exposed as DSL: http://github.com/jcapote/fieldy

Lastly is AtomLog, a way to parse and expose ruby's Logger output to an atom feed: http://github.com/jcapote/atomlog