Rb-AppScript is an event bridge between Ruby and OS X that allows you to get AppleScript-esque control in OS X. The Appscript creators claim Appscript is a 'serious alternative' to AppleScript and it certainly looks good. Check out this example:
The eminent Dr. Nic Williams has put together a useful generator that makes it a lot easier to construct your own gems. It's an ideal script if you've never put a gem together before, or if you're sick of the repetition involved. Nic tells me that this tool might make its way into the core RubyGems distribution in the future, but it's worth playing with straight away.
Some user mail from Nathan Murray:
SessionTimeout is a Rails plugin by Luke Redpath that makes enforcing short session times easy, like so:
James Edward Gray II laments:
BetaBrite is a Ruby LCD sign library developed by Aaron Patterson. Since few people have LCD signs to play with, Aaron has set up a test-bed installation that you can use via DRb. Ingenious! Next I expect a Ruby blinkenlights library and DRb hookup.
(First seen at why's)