my biggest problem with all of these framework is using them on an existing site. it would be great if all of them wrapped there styles in a parent class that way it wouldn't breaking existing styling.
* Bourbon: A mixin library for Sass (http://bourbon.io/docs/) * Neat: A semantic grid framework built on top of Sass and Bourbon (http://neat.bourbon.io/)
And for the LESS junkies out there: * LESS Elements: Mixins library for LESS (http://lesselements.com/) * Semantic.gs: Semantic CSS grid system for LESS (http://semantic.gs/)