BuiltWith - Find out the technology behind websites
Zen Flowchart - The simplest tool to create flowcharts
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Speedy Flowchart - For developers to be able to draw flowcharts, convert them into text files and add them into there code or readme quite quickly.
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
Wireflow - Create beautiful flowcharts