Alternatives to sup for all platforms with any license

  • Thunderbird icon

    Thunderbird

    Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after...

    Open Source Mac Windows Linux BSD Haiku

  • Apple Mail icon

    Apple Mail

    There’s big news attached. The best way to manage email on a Mac gets even better with OS X Yosemite.

    Free Mac iPhone iPad

  • eM Client icon

    eM Client

    eM Client is a full featured e-mail client with a modern and easy to use interface. eM Client also offers calendar, tasks, contacts...

    Free Personal Windows

  • Postbox icon

    Postbox

    Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity...

    Commercial Mac Windows

  • Opera Mail icon

    Opera Mail

    Opera Mail powerfully organizes, indexes, and sorts your messages. It has spam filtering (both automated and Bayesian), supports...

    Free Mac Windows

  • Evolution icon

    Evolution

    Evolution is the official personal information manager and workgroup information management tool for GNOME. It combines e-mail...

    Open Source Linux BSD GNOME

  • Zoho Mail icon

    Zoho Mail

    Zoho Mail is a webmail service built with the needs of a modern business in mind. It provides features for business users to...

    Freemium Web / Cloud Android iPhone

  • Geary icon

    Geary

    Geary is an email application built for GNOME 3. It allows you to read and send email with a simple, modern interface.

    Open Source Linux BSD GNOME

  • Claws Mail icon

    Claws Mail

    Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated...

    Open Source Windows Linux BSD Xfce

  • Airmail icon

    Airmail

    Airmail is a lightweight and lightning fast mail client for Mac. Feature list: Accounts: - Unified Inbox and folders - Multi...

    Commercial Mac iPhone iPad Apple Watch

  • Sylpheed icon

    Sylpheed

    Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA). Sylpheed runs on many systems such...

    Open Source Mac Windows Linux BSD

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  • Mutt icon

    Mutt

    Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message...

    Open Source Mac Windows Linux Xfce

  • The Bat icon

    The Bat

    The Bat! is a secure email client software, built to protect your correspondence against third-parties.

    Commercial Windows

  • Windows Live Mail icon

    Windows Live Mail Discontinued

    Windows Live Mail (formerly named Windows Live Mail Desktop) is a freeware email client from Microsoft. It is the successor to Outlook...

    Free Windows

  • Sparrow icon

    Sparrow Discontinued

    Sparrow is a minimalist mail application for Mac. It was designed to keep things simple and efficient. No fancy stuff here... just...

    Commercial Mac iPhone

  • Zimbra Desktop icon

    Zimbra Desktop

    The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts...

    Free Personal Mac Windows Linux

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  • Polymail icon

    Polymail

    The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.

    Freemium Mac iPhone iPad

  • Mail icon

    Mail

    Windows 10 has Mail and Calendar apps already built in. With the Mail application you can now...

    Free Windows

  • MailMate icon

    MailMate

    MailMate is an IMAP email client for Mac OS X featuring extensive keyboard control, Markdown supported email composition.

    Commercial Mac

  • Kontact icon

    Kontact

    Kontact is the integrated Personal Information Manager of KDE. Kontact suite unites mature and proven KDE PIM applications under...

    Open Source Windows Linux

  • Kontact - KMail icon

    Kontact - KMail

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

    Open Source Mac Windows Linux BSD

  • Alpine icon

    Alpine Discontinued

    Alpine is a fast, easy to use email client that is suitable for both the inexperienced email user as well as for the most demanding of...

    Open Source Mac Windows Linux

  • Mulberry icon

    Mulberry Discontinued

    Mulberry is a powerful, easy to use electronic mail (email) and calendar program that allows you to send, access, and manage email and...

    Open Source Mac Windows Linux

  • Simple Mail icon

    Simple Mail

    Simple Mail is a mail client for Firefox. It allows you to get notified, read and write messages for multiple email accounts inside...

    Free Mac Windows Linux Firefox

  • GyazMail icon

    GyazMail

    GyazMail is a email client software for Mac OS X, based on Cocoa framework, simple, easy-to-use with many features.

    Commercial Mac

  • Columba icon

    Columba Discontinued

    Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization...

    Open Source Mac Windows Linux BSD

  • Email.biz icon

    Email.biz

    Indian Webmail service allowing people to sign up for an @email.biz mail account. Cloud based Login and Multiple Login System give...

    Free Web / Cloud

  • IBM Notes icon

    IBM Notes

    IBM Notes (formerly IBM Lotus Notes) is a desktop client for social business. This email software includes messaging, applications and...

    Commercial Mac Windows Linux

  • notmuch icon

    notmuch

    Notmuch is a system for indexing, searching, reading, and tagging large collections of email messages. It uses the Xapian library to...

    Open Source Linux

  • astroid

    A graphical threads-with-tags style, lightweight and fast, email client for notmuch, inspired by sup and others

    Open Source Linux

  • Koma-Mail icon

    Koma-Mail Discontinued

    Koma-Mail is an email client which is comfortable and has very handy functions. It does not need an installation, so that you can run...

    Free Windows

  • i.Scribe (InScribe) icon

    i.Scribe (InScribe)

    Scribe is a small and fast email client with an intergrated contact database and calendar. It supports all the major internet mail...

    Freemium Mac Windows Linux Haiku

sup Comments

SUP revived at github

Comment by Seth
about sup Jun 2016

SUP got a second lease on life over at github. https://github.com/sup-heliotrope/sup/

Reply

think FOSS console based mail client inspired by gmail

Comment by Seth
about sup Jan 2013

...which is now sadly abandonware.

The mailing list is still pretty active however, and there have been stirrings of re-instating the project on github.

http://rubyforge.org/mailman/listinfo/sup-talk

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