Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Junk Email Filter - Junk Email Filter is a front end spam filtering and virus blocking service for email servers.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Covideo - Covideo is a Video Email Platform for Businesses that enables companies to communicate quickly and effectively with their customers.
The Bat - The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.
Outlook4Gmail - Outlook4Gmail provides easy synchronization of your Outlook and Google accounts