Css-tmbundle is a project mainly written in ..., it's free.
NO LONGER MAINTAINED - tmDelta to add support for folding CSSEdit style groups
This repo contains a tmDelta file that adds folding support for CSSEdit groups.
CSSEdit allows groups to be created as follows:
/* @group My Group */
.. some css
/* @end */
The tmDelta file in this repo adjusts TextMate's CSS folding markers so you can fold groups.
cd ~/Library/Application Support/TextMate/Bundles/
git clone git://github.com/itspriddle/css-tmbundle.git CSS.tmbundle
http://css-tricks.com/forums/discussion/2783/foldable-textmate-css-groups-i.e.-cssedit/p1