Rails_stacktrace_txmt_linker is a project mainly written in JavaScript, it's free.
Chrome extension to link the Rails stacktrace with textmate URL scheme
Chrome Extension that adds the Textmate URL scheme to the Rails stacktrace output.
Began as a fork of http://github.com/ryankshaw/rails-stacktrace-textmate-linker-greasemonkey-script/
Ended up rewriting from scratch and adding jQuery. Tested only with Google Chrome, should work with any Greasemonkey-enabled browser.
jQuery is downloaded from the Google CDN, so if you're offline this script won't work.
Open the js file with Chrome
Through the Tools > Extensions page