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Try StyleDocco, a tool I built but now maintained by marrs.

http://jacobrask.github.io/styledocco/ https://github.com/jacobrask/styledocco

(edit: I see now that the Hologram site mentions StyleDocco as a similar project)

The Agency I work for built a tool call ElementCSS for the 2013 Rails Rumble. It's currently not under active development, but we're going to begin work on it soon to turn it in to a more usable product.

Link: http://elementcss.com/

KSS does, assuming you comment your CSS/Sass/Less in the proper way. http://warpspire.com/kss/