BuiltWith - Find out the technology behind websites
Autonomous Visualization System - Make a leap with your autonomous and robotics data
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Ubeen - Data visualisation for your #Uber ride history
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
City Roads - This website allows you to select a city and then draws every single road on a screen.