Iteratively - Collaborate with your entire team to ship high-quality analytics faster and be confident in the results.
BuiltWith - Find out the technology behind websites
Census - the #1 Reverse ETL tool for data teams
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Competitors App - Competitors App helps marketers monitor their competitors' marketing moves in one place, with very little time investment.
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.