Require.js
Require.JS is a javascript based javascript file and module loader. Require.js runs in the browser and has a handy optimsation tool that can run in node.js
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imgSizer.js
Imgsizer.js cycles through your document, swaps out the images for a transparent GIF, and applies the AlphaImageLoader property to each one.
Enquire.js
Enquire.js is a lightweight, pure JavaScript library for handling media queries. It is less than 1kb when GZIP'd and minified, and has absolutely no dependencies. Yup, you read that right - no dependencies, not even jQuery! The most you will have to do is provide a matchMedia polyfill if you wish to support browsers without a native implementation.
SequenceJS
Sequence provides the complete functionality for a website slider without forcing you to use a set theme. In fact, Sequence has no in-built theme, leaving you complete creative control to build a unique slider using only CSS3 -- no jQuery knowledge required!