redWall is a bootable firewall CD with web-based status reporting; includes Spam Filtering, etc. Configuration data are stored on a floppy or USB disk.
Conflux is web-based collaboration software offering a CDR, T&C, as well as an email client; with support for Unicode, multiple languages, and date/time formats for the English, German, and Estonian languages.
Zimbra: server and client technology for the next-generation! Featuring a browser-based AJAX client and mail that is integrated with contacts and calendar.
Archmbox is an open source email archiver which extracts email messages from one or more mailboxes to a specified location for perusal at a later date.
Althea is an IMAP email client built with that protocol in mind in order to avoid many of the pitfalls experienced by POP clients that added said support.
