webmlist is a Web mailing list archive system written in PHP intended to be used against an anonymous IMAP backend. It is very simple, and is intended to be lightweight and fast rather than full-featured, though it supports multiple folders, as well as both threaded and sorted views that are dynamically generated from the message store.
werkmail is a browser-based mail client written in php. It handles imap and pop3 mail servers. It supports attachment sending and viewing, cc and bcc fields, replying, forwarding and deleting mail. It is not necessary that the host serving werkmail and the computer the mailbox is located on are the same machine. The user can connect to werkmail (and to his mailbox) from every computer in the world that has an internet connection and a web browser.
whatsnewfm is a filter for the daily freshmeat newsletter. It shows only news items that you haven't seen before (so you don't have to read about every update of applications that you aren't interested in). You can also set up a list of "interesting" applications where you want to be informed of every update.
xbmcmail-imap is an IMAP/IMAPS email reader for the XBox using the XBox Media Center's builtin Python engine. It supports attachments, folders, mail management (copy, move, delete), printing (text or postscript), multiple accounts, background polling, RTF and HTML converters, and more.