Stringformatter
JS string formatter that supports objects, currency, date/time, decimals, and more supports easy extension and garbage collection ... goes far beyond sprintf approach.
ES5 Shims
ECMAScript 5 compatibility shims for legacy JavaScript engines
Es6 Shim
ECMAScript 6 (Harmony) compatibility shims for legacy JavaScript engines
Taggd
A tool to show and add tags to images
Console.message
Console messages for cool kids
Typecast.js
Typecast.js :: Solving the simple problems
Extract Values
A simple helper to extract values from a string based on a pattern.
Yepnope.js
An Asynchronous Conditional Resource Loader
Xregexp
Extended JavaScript regular expressions
Respond
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)
Flexie
Legacy support for the CSS3 Flexible Box Model
Underscore String
String manipulation extensions for Underscore.js javascript library.
Placeholders.js
A JavaScript polyfill for the HTML5 placeholder attribute
CSS3 Pie
A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties
Nerdamer
a symbolic math expression evaluator for javascript
jQuery Number
Easily format numbers for display use. Replace numbers inline in a document, or return a formatted number for other uses.
Svgeezy
Allows for automatic Image fallbacks for browsers that can't handle SVGs