WhatWeb

Web scanner, recognises web technologies including content management systems (CMS), blogging platforms, statistic/analytics packages, JavaScript libraries, web servers, and embedded devices, also identifies version numbers, email addresses, account IDs, web framework modules, SQL errors, and more; more than 1800 plugins

Category
Web Application Exploitation
Website
https://www.morningstarsecurity.com/research/whatweb
Source code
https://github.com/urbanadventurer/WhatWeb
Price
Free