BuiltWith - Find out the technology behind websites

Parse.ly Analytics - Analytics for understanding audience attention

Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.

Pavooq - Pavooq is the analytics tool for work communicators, like Slack, MS Teams, Zoom, and work emails.

WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.

GoSquared People Analytics - One place to understand your users