StickyStack.js is a jQuery plugin for creating a stacking content effect. Panels stick as they reach the top of the viewport to create the effect.
Colofilter.css lets you easily add duotone filters to photos using CSS. It's a cool effect, but doesn't work in every browser, so make sure you don't use it ...
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UnMQ removes media queries from your CSS while preserving rules that match a hard-coded viewport. It's useful for outputting CSS for older desktop browsers, like IE8.
Protip is a jQuery tooltip plugin for any situation. It includes 49 positions, live refresh of options, click-activated and sticky tooltips, and more.
Utility OpenType offers simple, CSS utility classes for creating advanced typographic features. It includes common and discretionary ligatures, small caps, case sensitive forms, and much more.
The Poor Man's Styleguide is a pragmatic frontend styleguide. It's quick-and-dirty, and designed to be copied and pasted into your CMS.