Pliek - Skyrocket your conversions with the live sales notifications
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
B2B SaaS Leads - Get a list of potential customers for your SaaS in 60 secs
BuiltWith - Find out the technology behind websites
Proofly - Proofly is a social proof notification and sales popup platform. Social proof and popup alerts help website or shopify store to increase conversions rate and sales.
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.