Alternatives to sup for all platforms with any license

Platforms

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  • 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 and chat.

    Free Personal Windows

  • Evolution icon

    Evolution

    Evolution is the official personal information manager and workgroup information management tool for GNOME. It combines e-mail, calendar, address book, and task list management functions. It has been an official part of GNOME since...

    Open Source Linux BSD GNOME

  • Opera Mail icon

    Opera Mail

    Opera Mail powerfully organizes, indexes, and sorts your messages. It has spam filtering (both automated and Bayesian), supports POP3 and IMAP, newsgroups as well as Atom and RSS feeds. Opera Mail uses one database that keeps an...

    Free Mac Windows PortableApps.com

  • 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 of Apple Mail, but with more power and flexibility to manage even the most demanding workloads. ...

    Commercial Mac Windows

  • 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

  • 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 communicate effectively while catering to the customization and mailbox management needs of IT...

    Freemium Web / Cloud Android iPhone

  • Claws Mail icon

    Claws Mail

    Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility ...

    Open Source Linux Windows BSD Xfce

  • Airmail icon

    Airmail

    Airmail is a lightweight and lightning fast mail client for Mac. Feature list: Accounts: - Unified Inbox and folders - Multi Account with editable html signatures. - Aliases management with custom SMPT - Support for Gmail...

    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 as Windows, Linux, BSD, Mac OS X and other Unix-like systems. Sylpheed uses GTK+ GUI toolkit. The...

    Open Source Linux Mac Windows BSD PortableApps.com

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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 threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various...

    Open Source Linux Mac Windows Xfce

  • 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, files and documents in the cloud, yet having them locally accessible when on the road. Zimbra...

    Free Personal Linux Mac Windows

  • 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 easily see all message from your favorite people, more clearly organize social updates and...

    Free Windows

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  • 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 and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news...

    Open Source Linux Mac Windows BSD

  • Pantheon Mail icon

    Pantheon Mail

    Pantheon Mail is a free open source email client forked by the elementary OS community from Geary . Features Modern and straightforward interface ...

    Open Source Linux elementary OS

  • 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 one roof. Thanks to the powerful KPart technology, existing applications are seamlessly integrated...

    Open Source Linux Windows

  • Alpine icon

    Alpine

    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 power users. Alpine is based on the Pine® Message System (http://www.washington.edu/pine/)...

    Open Source Linux Mac Windows

    • Discontinued not updated since 2008......see http://www.washington.edu/alpine/changes.html
  • Mulberry icon

    Mulberry

    Mulberry is a powerful, easy to use electronic mail (email) and calendar program that allows you to send, access, and manage email and calendars. Mulberry also helps you manage other related information, such as contact information. ...

    Open Source Linux Mac Windows

    • Discontinued The project is no longer developed. Last version, 4.0.8, released in February 2007, can be still downloaded from the official website.
  • 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 Firefox. Usage: Configure one or more accounts in Preferences, set account refresh time and get...

    Free Linux Mac Windows 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

    Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication.

    Open Source Linux Mac Windows BSD

    • Discontinued The project is no longer developed. Last version, 1.4, released in March 2007, can be still downloaded from SourceForge.
  • 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 you safe and secure access to your POP / IMAP email accounts. Now access your email with any Web...

    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 social collaboration. IBM Notes features a clean, modern social user interface that provides...

    Commercial Linux Mac Windows

  • notmuch icon

    notmuch

    Notmuch is a system for indexing, searching, reading, and tagging large collections of email messages. It uses the Xapian library to provide fast, full-text search of very large collection of email with a very convenient search...

    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

    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 Koma-Mail from your flash drive but, of course, also on your desktop. For safety reasons...

    Free Windows

    • Discontinued The program seems to be no longer updated. Last version, 3.83, released in March 2012, can be still downloaded from the official website.
  • 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 protocols and uses international standards where possible. Scribe doesn't required installing or...

    Freemium Linux Mac Windows Haiku

  • EmailTray icon

    EmailTray

    EmailTray is a smart email client and an email notifier for POP3 and IMAP email accounts, including Gmail, Hotmail, Yahoo mail and AOL. EmailTray intelligently ranks messages, prioritizes them into 4 Inboxes and alerts you only to the...

    Free Windows Android

  • Canary Mail icon

    Canary Mail

    Canary is an exciting new email client for Mac that's fast, simple, and secure.

    Free Mac iPhone

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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