Sparky.js is a client-side application scaffold which helps those who want to have organized structure in their app, but don't want to subscribe to a particular client-side MVC framework.
http://forrst.com/posts/Sparky_js_A_client_side_Application_Scaffold-aE4
Lightweight wrapper for adding @user mention functionality to Twitter Bootstraps Typeahead plugin.
FastClick is a simple, easy-to-use library for eliminating the 300ms delay between a physical tap and the firing of a click event on mobile browsers. The aim is to make your application feel less laggy and more responsive while avoiding any interference with your current logic.
accounting.js is a tiny JavaScript library for number, money and currency formatting, with optional excel-style column rendering (to line up symbols and decimals).