Searchable GDPR - Easily search in the official GDPR text thanks to Algolia
BuiltWith - Find out the technology behind websites
GDPR Form - The easiest way to handle data subject access requests
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
iubenda for GDPR - Finally an easy, all-in-one solution to comply with the GDPR
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.