Created by Jim Shingler (@jshingler), based on the Grails Bundle originally from Luke Daley (@ldaley).
Follow these instructions to keep your copy up to date
mkdir -p /Library/Application\ Support/TextMate/Bundles
cd /Library/Application\ Support/TextMate/Bundles
git clone https://github.com/griffon/griffon.tmbundle.git
Alternatively if you do not have git installed you can download a copy of the repository in tar.gz or zip format and uncompress it inside /Library/Application\ Support/TextMate/Bundles