Adi.js is a lightweight jQuery plugin for Adblock detection.
jQuery.isInView is a jQuery plugin that tells you if elements are in view inside a scrollable container, or inside a container hiding its overflow – and does it blazingly fast, made for hot code paths.
franc is a library to detect the language of text. It supports more languages than any other library, or Google.
Scroll Detection is a simple way to detect the distance the user has scrolled on your website.
In example, it is used to drop down a navigation bar so the user does not have to scroll all the way back up the page in order to navigate to the next area. It could also be used for sliding in a social sharing bar, displaying more content.