QGMailNotifier is a portable GMail notifier designed to provide all of the functionality that the official Windows notifier has and more.
Sonicmail is a POP3 email notifier GNOME applet. It will notify you when you receive new emails by displaying a selectable icon in the applet. Also, optionally, a sound may be played. Sonicmail is fully configurable.
speaking mailbox is a modified xmailbox program which is able to speak From and Subject fields from the incoming mail.
speechbiff is a simple perl script that has functionality resembling the BSD biff program. Instead of displaying information about new mail in the terminal, speechbiff uses the /dev/speech device to read the information aloud with a text-to-speech package.
systraymail is a little application that sits in the system tray, and provides notification of new mail. It was written in C using GTK and libmailutils.
tkbiff is yet another program to alert you to incoming mail. tkbiff allows arbitrary commands to be executed upon mail reception.
WMBiff is a dock applet for WindowMaker which can monitor up to 5 mailboxes. It can read POP3, APOP, IMAP/IMAPS, mbox and maildir mailboxes as well as licq history files. It can also perform actions on the mailboxes upon mouse clicks or new mail arrival.
This is a DockApp, intended for use with WindowMaker or fluxbox -window managers. It has a graphical configuration interface using GTK+.
wmMultiPop3 is a WindowMaker dockapp which checks one or more pop3-accounts for new mail. It's based on wmPop3.
WMpop is a WindowMaker DockApp for monitoring a POP3 mailbox. It can be configured via a graphic interface written in GTK+. It displays: number of mails in the mailbox (or unread mails if checked in the preference screen), a scrolling text with the email address of the senders (only for local mailbox for the moment), and a status led, indicating mail checking progression and errors.
WMPop3 is a Window Maker dockable that inform sa user on how many messages are currently in their pop3 mail box.
xbiff 2 is a graphical mail notificator. Highly configurable, it gives choice between several appearances and several languages. It works with local mail or with a pop3 or imap4 server. It allows to configure the actions to run when receiving a new mail, and also for reading or writing mails.
XLassie is a replacement for the standard X mail notification tool, XBiff. It features counting the number of new messages you have, can query a POP3 server or an IMAP server, uses less memory than XBiff, can run a command when clicked on.
xmailheaders is a mail notification utility based on the mailbox utility that's available on Solaris workstations. The idea is that it sits on your desktop somewhere, periodically polling the mail server/spool for new messages. New message headers are displayed as they come in. Supported mailbox formats are POP3, IMAPv4, and Unix mail. SSL-based password authentication is also supported for POP and IMAP.