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JavaScript
Chosen is a JavaScript plugin that makes long, unwieldy select boxes much more user-friendly.
CoffeeScript
Harvey lets you add a second face to your application’s JavaScript. Neat!
An easy-to-use implementation of the side navigation pattern popularized by apps like Sparrow and Facebook.
Ruby
This is a simple, no-fuss generator for OpenXML (aka XLSX) files. No formatting or styles included, just few basic datatypes.
Tick is a JavaScript plugin that makes visualizing dynamically changing numbers a breeze.
When testing, it's useful to manipulate time to test across multiple timezones or specific calendar dates.