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SPF

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.

Google Apps for Business

Google Apps for Business Usage Statistics · Download List of All Websites using Google Apps for Business

Web-based email, calendar, and documents for teams. Renamed to Google Apps for Work, but now known as G Suite from Google Cloud.

Business Email Hosting

SSL by Default

SSL by Default Usage Statistics · Download List of All Websites using SSL by Default

The website redirects traffic to an HTTPS/SSL version by default.

LetsEncrypt

LetsEncrypt Usage Statistics · Download List of All Websites using LetsEncrypt

Let’s Encrypt is a free open Certificate Authority.

Root Authority

HSTS

HSTS Usage Statistics · Download List of All Websites using HSTS

Forces browsers to only communicate with the site using HTTPS.

Cogeco Peer 1

Cogeco Peer 1 Usage Statistics · Download List of All Websites using Cogeco Peer 1

Managed hosting, cloud hosting and datacenters since 1999.

Cloud Hosting · US hosting

CloudFloorDNS

CloudFloorDNS Usage Statistics · Download List of All Websites using CloudFloorDNS

Managed cloud DNS solution from Everbridge Solutions.

Enterprise DNS

nginx

nginx Usage Statistics · Download List of All Websites using nginx

nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.

Varnish

Varnish Usage Statistics · Download List of All Websites using Varnish

Varnish is a web accelerator / reverse proxy caching server.

Varnish Server

Google Webmaster

Google Webmaster Usage Statistics · Download List of All Websites using Google Webmaster

Webmaster tools provide you with a free and easy way to make your site more Google-friendly.