Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
Object.observe polyfill/shim trying to be compliant
A simple helper to extract values from a string based on a pattern.
Tired of adding prefix for each broswer when it comes to the new css3 attributes?
A lightweight engine that allows you to hitch new capabilities to the browser (prollyfill).
CSS4 parent selector based on jQuery
Typecast.js :: Solving the simple problems
Tiny polyfill for the placeholder form element attribute. Requires Prototype.js.