Butter.us - Virtual workshops smooth as butter
BuiltWith - Find out the technology behind websites
Pop - Super fast, lo-fi video texting with close friends
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.