Omnipipe is a project mainly written in Ruby, it's free.
web pipes for your browser's omnibar!
"What if the URL bar supported unix pipe semantics? ex: "http://longurl.com | bitly", "http://foo.cn | translate english", ..."
Demo @ http://omnipipe.herokuapp.com/
Unfortunately Chrome doesn't provide an API to listen to "url submit" events, but we can approximate what this functionality would "feel" like by creating and leveraging a custom search engine. This "search engine" simply takes in the URL and the pipe parameters as a query string, and then does the right thing.
For instructions on how to install & use, check http://omnipipe.herokuapp.com/
MIT License - Copyright (c) 2011 Ilya Grigorik