BuiltWith - Find out the technology behind websites
Bites - Ready to use modals and popups
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Freebiebucket - Curated free tools & resources for makers 🛠
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
Hello Bar - Hello Bar, the simplest way to grow your email list. Have your opt-in live in minutes. No developer required.