JavaScript libraries
jQuery The Write Less Do More JavaScript Library

Widgets
AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget

Ecommerce
The World Wide Web Consortium W3C develops standards and guidelines to help everyone build a web based on the principles of accessibility internationalization privacy and security

JavaScript libraries
A sizzlin hot selector engine Contribute to jquery sizzle development by creating an account on GitHub