Jira-tracker-bridge is a project mainly written in Ruby, it's free.
This script takes open bugs scheduled in Jira and adds them to a Pivotal Tracker Icebox
This script copies open bugs in Jira into a Pivotal Tracker icebox.
sudo gem install soap4r svn co http://svn.rubyhaus.org/jira4r/trunk/ jira4r
cp config.yml.example config.yml
To get your Tracker API token, go to "My Profile" in Tracker and look at the API Token section