BuiltWith - Find out the technology behind websites

Code Zero - Code Zero is a rich-featured Kubernetes platform for quickly and easily delivering cloud-native software solutions to perform various operations like integrating Debugging, testing, building, containerizing, and others.

Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.

LeadMD - LeadMD is the revenue performance consultancy that cuts through the BS by making your vision actionable and your outcomes measureable

What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.

Sirius - An open-source clone of Siri from UMICH