JavaScript libraries
Polyfill io is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser

JavaScript libraries
Touch enabled jQuery plugin that lets you create beautiful responsive carousel slider

Miscellaneous
Less extends CSS with dynamic behavior such as variables mixins operations and functions Less runs on both the server side with Node js and Rhino or client side modern browsers only n

JavaScript libraries
jQuery The Write Less Do More JavaScript Library

Analytics

UI frameworks
Powerful extensible and feature packed frontend toolkit Build and customize with Sass utilize prebuilt grid system and components and bring projects to life with powerful JavaScript plugins

CDN
The recommended free CDN for Bootstrap Font Awesome Bootswatch and Bootstrap Icons

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