Personally I don't use any of those frameworks, in my opinion they restrict too much. I'm fine with SASS + Compass or Stylus + Nib plus a grid system, typically

Personally I don't use any of those frameworks, in my opinion they restrict too much. I'm fine with SASS + Compass or Stylus + Nib plus a grid system, typically The Semantic Grid which has versions for all common pre-processors. Every project is different, I don't think there's a library that you can re-use without looking too similar. I mean, look at most Bootstrap sites, you can tell it's Bootstrap.