Countable is a tiny and standalone JavaScript function that brings the ability to count all three. It works very straightforward and has the option to count the inputs with stripping HTML tags.
Hitch is a lightweight JavaScript library that adds expressive capabilities to CSS files. It has some of the powers of CSS preprocessors like prefixing or variables but also some other stuff.
Skel.js is a tiny JavaScript framework what have a 12-column grid system (~6kb gzipped and minified) that simplifies building responsive layouts very much.