Frameworks

Bug BountyBug Bounty

Bug Bounty Usage Statistics · Download List of All Websites using Bug Bounty

The website has some form of responsible disclosure mechanism for the reporting of security vulnerabilities.

Email Hosting Providers

SPFSPF

SPF Usage Statistics · Download List of All Websites using SPF

The Sender Policy Framework is an open standard specifying a technical method to prevent sender address forgery.

Web Servers

ApacheApache

Apache Usage Statistics · Download List of All Websites using Apache

Apache has been the most popular web server on the Internet since April 1996.