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Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
HelpSite - HelpSite is a simple service to help your setup the perfect support centre or help site.
BuiltWith - Find out the technology behind websites
Manula - Manula is an online software for creating user manuals.
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.