Evolution is the GNOME mailer, calendar, contact manager, and communications tool. Evolution represents the next step forward in GNOME applications. The tools which make up Evolution will be tightly integrated with one another and act as a seamless personal information-management tool.
GNUSTEP Live CD contains a lot of software for GNUstep, a free implementation of the OPENSTEP framework (which is also directly used in Mac OS X as Cocoa). It includes excellent applications for RAD (GORM and ProjectCenter). The CD is available for i486, AMD64, Apple Mac PowerPC, and Sun UltraSPARC computers.
Mail Notification is a status icon (aka tray icon) that informs you if you have new mail. It works with system trays implementing the freedesktop.org System Tray Specification, such as the GNOME Panel Notification Area, the Xfce Notification Area, and the KDE System Tray. Mail Notification features include multiple mailbox support, Evolution, Gmail, IMAP, Maildir, mbox, MH, Mozilla products, POP3, Sylpheed, Windows Live Hotmail and Yahoo! Mail support, SASL and APOP authentication support, SSL/TLS support, automatic detection of mailbox format, immediate notification, message popups, and HIG 2.0 compliance.
gnubiff is a mail notification program that periodically checks for mail and displays headers when new mail has arrived. It supports multiple mailboxes, pop3, apop, imap4, mh, qmail and mailfile, SSL and certificates, GNOME with integration to the panel, GTK standalone, automatic detection of mailbox format, mail header and content display, PNG animation, HIG 2.0 compliance, and spam filtering.
Akeni Instant Messaging Server Pro is a client/server instant messaging platform that allows companies to host their own secured private IM system. The client has an user interface similar to AIM, ICQ, or MSN Messenger. It supports all the standard IM features such as chat, group conference, presence management, file transfer, offline messages, and emergency alert/notification. Extra features include contact management and optional tabbed chat sessions. The server has advanced administration tools for managing user accounts, client-side logging capabilities, and peer-to-peer file transfers. It can be set up on a private network without connecting to the Internet, and can easily be set up for use inside and outside of the company firewall.
KBiff is a KDE "biff" or new mail notification utility. It is highly configurable but very easy to use and setup. It supports session managment (it "remembers" the last state it was in before you logged off) and can be docked into the panel. It has support for mbox (Unix-style), maildir (qmail-style), mh, POP3, IMAP4, and NNTP mailboxes.
Akeni LAN messenger is a cross-platform instant messenger client. It is a P2P program that works on your LAN without the need of an Internet connection or a dedicated server. The client has an user interface similar to AIM, ICQ, or MSN Messenger. It supports all the standard IM features such as chat, group conference, presence management, file transfer, and emergency alert/notification. Extra features include contact management and optional tabbed chat sessions.