CSS Tool : Simple CSS
Simple Css is desktop tool, which is able to edit css. It's able to reload css or edit css and export it. If you use notepad++ to edit your css, Simple Css could provide more function, because you can just choose what's value you need. It's a tool if you job is deal with css everyday. So enjoy it.
If you know most of css syntax, probably using browser(IE, FireFox) or IDE(visual studio) is enought for you to edit css, might don't need this tool.