What are your favorite lesser-known gems/plugins for Rails?
This question about Rails plugins brought up only the usual suspects (Paperclip, RSpec, Shoulda, Restful Auth, etc). It’d be great to get a list going about the hidden, less popular ones that rock.
I just started using App_Version. It’s nice to be able to put the version of the app that your running on the bottom of your page (Like the “svn revision” number on the bottom right-hand corner of this page).