Interface Index - The «Interface Index» is a 🏷 collection of UI elements from great B2B, SaaS and desktop applications and services – such as GitHub, Mailchimp or Loom.You can use it to 🏎 speed up your interface research or as 👩🎨 visual inspiration.
BuiltWith - Find out the technology behind websites
patool - patool is a portable command line archive file manager
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
atool - atool is a script for managing file archives of various types (tar, tar+gzip, zip etc)
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.