BNM helps you design and send massive emails in HTML format
Bulk Newsletter Platform(BNM) provides the components necessary to send bulk email in HTML format. BNM is written in PHP and it is appropriate to work either standalone on a server or embeded in an existent website. It is an easy to use, marketing tool which allow the user to create and send massive advertisements and newsletters in HTML to his mailing list.
CangrejoMail it's a mod of the popular webmail "SquirrelMail". All the html code has been changed to XHTML, this way, all the interface is handle by CSS with the possibility to work with themes.
Toutateam is a groupware application aimed for everyday work. It allows to share files, mails, calendar, communicate through forum or instant messaging, wiki...
Based on the famous PHProjekt, it uses PHP and MySQL and is accessed through a web-browser.
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Teak is an GUI IMAP (could also do POP3 and NNTP with some work) mail client written in php-gtk (gtk.php.net). It's still in the early stages of development but already can read/send mail via an IMAP server and local SMTP host.