Designer Work Tools 2013
I can already complaiine that none of the tools for live CSS editing, support SASS or LESSĀ (or other pre processor).
But they speed up your life so much we cannot complaine longer.
CSS updater
FireBug plug in http://www.cssupdater.com/
Prerequisites: Adobe Air, Firefox and minumum FireBug
Style Editor 1.0
https://addons.mozilla.org/en-US/firefox/addon/style-editor/?src=api
Requirements: Firefox 12.0 and later
Ma con Firefox 25.0 non compare il menu in right click
Synoptx LiveStyle
Propertary plugin build in PHP and Javascript is a multiplatform solution, adaptable for different CMS: WordPress Drupal Joomla. is the direct son of the propertary Spacecake CMS of the Web and Software Developer SynOptx.net
Colorpicker
What a waste Filezilla Colorpicker it copy just the color hexe code that are wrote in the css code
Colorzilla
Not only the best colorpicker on add ons market but also a precious tool for gradient generator!
Colorzilla pick also the value color from images, jpg… converting in webstandard Hex format.
If I can say something the only bad thing will be to have another standalone on the tollbar of my browser.