Ultimate Push Notifications by Ecomfit - Retarget customers and protect abandoned cart to boost sale
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Analyzify - Google tag manager and analytics app for your Shopify store
BuiltWith - Find out the technology behind websites
Pusher Beams - Send push notifications programmatically at scale
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.