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Thunderbird delivers. Enjoy safe, fast, and easy email, with intelligent spam filters, quick message search, and customizable views. Brought to you by Mozilla, Thunderbird makes email better. User web site: http://www.mozilla.com/thunderbird
Evolution provides integrated mail, addressbook and calendaring functionality to users of the GNOME desktop.
KDE PIM is sub project of KDE. Its goal is to provide an application suite to manage personal information. This includes mail, time, people and more. The main result is KDE Kontact, our personal information manager.
Claws Mail is a GTK+ based, lightweight, and fast email client. Almost all commands are accessible with the keyboard. It also has many features such as multiple accounts, POP3/SMTP/IMAP/NNTP support, OpenSSL, GnuPG, and LDAP support, a plugin system, spell checking, filtering, Actions, spam and ... [More]
Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA). It runs on Unix-like systems such as Linux, BSD, and Mac OS X, but also supports Windows.
Chandler is an interpersonal information manager that adapts to your changing needs. Chandler offers innovative capabilities in calendar sharing to support workgroup collaboration. Chandler sharing is server-based, works across platforms and supports multi-author editing.