Content Delivery Network

Google Cloud StorageGoogle Cloud Storage

Google Cloud Storage Usage Statistics · Download List of All Websites using Google Cloud Storage

Store objects of any size and manage access to their data on an individual or group basis within the Google network.

Email Hosting Providers

Google Apps for BusinessGoogle 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

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