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

Analytics
Clarity is a free user behavior analytics tool that helps you understand how users are interacting with your website through session replays and heatmaps

JavaScript libraries
jQuery The Write Less Do More JavaScript Library

Font scripts
The internet s icon library toolkit Used by millions of designers devs content creators Open source Always free Always awesome

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