Chance.js is a javascript library that can generate random numbers, characters, strings, names, addresses, dice, and pretty much anything else.
Timing.js is a small set of helpers for working with the Navigation Timing API to identify where your application is spending its time. Useful as a standalone script, DevTools Snippet or bookmarklet.
Underscore.string is a string manipulation helpers for javascript. Originally started as an Underscore.js extension but is a full standalone library nowadays.
Classie is a lightweight script that allows you to add, remove, toggle, and check for classes in the DOM easily.
Paulzi Form is a javascript form helper library.
Features
Maplace.js helps you to embed Google Maps into your website, quickly create markers and controls menu for the locations on map.
It requires jQuery and Google Maps API v3 so you need to have both in your page.
This is a simple jQuery plugin that helps you add the Facebook Javascript SDK to your site asynchronously. It also allows you to to use jQuery events to run code before and after the Facebook's code is initialized.