TkRat is a graphical Mail User Agent (MUA) which handles MIME. It is mainly written in C, but the user interface is done in Tcl/Tk. The program currently understands UNIX mailboxes, POP, IMAP, and mh folders. Messages are sent via SMTP or any user configured program (sendmail, for example). It has support for disconnected IMAP operations.
quickmail.php is a script that reads email from a mail server and outputs it in RSS format that can be displayed in a browser (as XML, using included XSL/CSS) or an RSS aggregator or as WML for use on WAP devices (mobile phones/PDAs). The output has been tested and found to be valid XSL/CSS, valid XML/RSS, and valid WML.
MUMail is a Java applet designed to let you read your mail from a web page. It enables you to check your mail when there is no mail reader available, or if you don't want to change the configuration of someone else's mail reader. All you need is a Java 1.1 compliant Web browser. MUMail uses POP3 to download mail and is MIME enabled.
Mailbox Sweeper lets you delete email messages in your mailbox without downloading them. You can log into your mailbox, preview the Subject lines of the messages stored there, then delete multiple selected email messages, or all of them at once. It's useful for cleaning spam-ridden mailboxes, or to delete a big attachment without having to download it.
Saké Mail is a very high performance Web-based email system, designed for scaling to large numbers of concurrent users. It takes advantage of the Java Servlet API's memory-resident architecture and multi-threading HTTP response model. It avoids file system accesses through memory caching at every possible point, and never needs to touch the file system at runtime at all if coupled with an IMAP server. It supports POP3, IMAP, and SMTP, including authenticated SMTP. It also provides an extremely sophisticated message rendering system that can easily handle even complex HTML encoded messages with attachments that have been forwarded multiple times.
Arrow is an elegant, powerful, graphical interface to electronic mail. This is not just another single window mail reader. Instead, it displays each mailbox and message in a separate window, thereby allowing one to simultaneously open as many mailboxes and view and compose as many messages as one wishes. This paradigm also allows one to drag-and-drop text between messages and organize ones mail by dragging messages between mailboxes.