BuiltWith - Find out the technology behind websites
Medium CLI - A command line Interface for reading Medium stories
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Phunt - Product Hunt command line interface
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
Mac CLi - OS X command line tools for developers