BuiltWith - Find out the technology behind websites
IndustryAlerts.io - Stay one step ahead of the competition with our intelligent daily email alerts.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Rivalfox - Rivalfox gives you real-time information to help you do your job better. We monitor your competitors’ digital marketing strategies so that you don’t fall behind the pack.
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
Rival IQ - The fastest way to build, analyze, and track competitors in your ever-changing market landscape.