GDPR Form - The easiest way to handle data subject access requests
BuiltWith - Find out the technology behind websites
G2 Track - Manage your entire technology stack in one dashboard
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
GDPR Email Copy - Email templates to use under GDPR
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.