Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
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.
Mutt - Add forums and commenting to your site. Unlimited posts, users and traffic, for free. Embeddable, styleable and scriptable.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Trojitá - Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern...