Apple Mail is an email client included with the operating systems macOS, iOS and watchOS by Apple Inc.

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

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.

Mailspring is a multi-platform email client.

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

K-9 Mail is an open source email client with support for multiple accounts, search, IMAP push email, multi-folder sync, flagging, filing, signatures.

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.

Mailplane is a Gmail client for Mac.

Microsoft Outlook is a personal information manager from Microsoft.