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.

Standard

Web Hosting Providers
SSL Certificates

QuoVadisQuoVadis

QuoVadis Usage Statistics · Download List of All Websites using QuoVadis

QuoVadis Trust/Link provides cost-effective identity management tools to securely identify users online, to protect privacy and data integrity with encryption, and to use legally binding digital signatures.

Operating Systems and Servers

UbuntuUbuntu

Ubuntu Usage Statistics · Download List of All Websites using Ubuntu

Ubuntu is a free, Debian derived Linux-based operating system, available with both community and professional support.