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
Swiper is the most modern free mobile touch slider with hardware accelerated transitions and amazing native behavior

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