Airmail is a fast mail client for Mac and iPhone.

eM Client is a Windows based e-mail client for sending and receiving e-mails, managing calendars, contacts, and tasks.

Evolution is the official personal information manager for GNOME.

KMail is the email component of Kontact, the integrated personal information manager from KDE.

Microsoft Mail and Calendar apps help you stay up to date on your email, manage your schedule and stay in touch with people you care about the most.

MailMate is an IMAP email client for macOS featuring extensive keyboard control, Markdown integrated email composition, advanced search conditions.

Claws Mail is a free and open-source, GTK+-based email and news client. It offers easy configuration and an abundance of features.

EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries, e…

Geary is an email application built around conversations, for the GNOME 3 desktop. It allows you to read, find and send email.

Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email.

Mailbird is a desktop email client for Windows 7, 8 and 10.

Mailspring is a multi-platform email client.