If you (by choice or cruel twist of fate) happen to be developing all your fancy preprocessed front-endy stuff on Windows, then Prepros(http://alphapixels.com/prepros) might just be the bottle that helps you to stop dreaming codekit-y dreams. It's got a built in local http server, active file compiling, live preview and lots of other stuff that will make your ear lobes tingle. Oh and it will preprocess anything but your 2000+ word hipsterish rantings about the latest pitchfork article. It's also free.
P.S. It's also available for OSX... if you're into that sort of thing.