Add any links you want in this to the comments and I'll add them.
Generates styleguides from Markdown comments in CSS, SASS and LESS files using Handlebars
DSS, Documented Style Sheets, is a comment styleguide and parser for CSS, LESS, STYLUS, SASS and SCSS code.
Front-end documentation engine The most powerful tool for documenting web interfaces and building productive team work. Git repo
KSS is intended to help automate the creation of a living styleguide. A styleguide serves as a place to publish KSS
Node port of KSS
StyleDocco generates documentation and style guide documents from your stylesheets. Git repo
JS (I think)
Generates bootstrap-like documentation for your own CSS! Git repo
A markdown based documentation system for OOCSS Git repo
Collect, test, and experiment with interface pattern pairings of CSS & HTML. Pears is an open source WordPress theme, enabling people like you to get your own pattern library up and running quickly. Git repo
documentation and visualize different states of UI elements defined in your CSS. Git repo