BuiltWith - Find out the technology behind websites

Owler - Owler is a crowdsourced data model allowing users to follow, track, and research companies.

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

Whatagraph - Whatagraph is the most visual multi-source marketing reporting platform. Built in collaboration with digital marketing agencies

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

QlikSense - A business discovery platform that delivers self-service business intelligence capabilities