Loop Email - Emailing for teams: Organize your Inbox into channels 💌
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
FastMail - Email, calendars, and contacts to highest standards of security, privacy and reliability.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
BlueMail - BlueMail is an email management app for Android, iOS, and Windows.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.