madkudu - We’re building a better knowledge base
BuiltWith - Find out the technology behind websites
Sparklane - Sparklane offers predictive lead scoring solutions.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Mobbo - Mobbo provides analytical insights to benchmark, compare and optimize mobile apps,
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.