AfterLogic WebMail Lite PHP is a free AJAXwebmail application. Users can receive, view, manage, compose, and send email through web interface (IMAP and SMTP supported). Source code included.
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.
This plugin will add to the AJAXWebmail RoundCube the ability to tag mails like it is done in Thunderbird. He will follow the same semantic as Thunderbird to manage tag, so tags set using this plugins will be seen in Thunderbird and vice-versa.
AtMail is an open source webmail client written in PHP. We aim to provide a elegant Ajaxwebmail client for existing IMAP mailservers, with less bloat and a focus on an intuitive, simple user interface.
Grace (Grace Ruby/Ajax Client for Email) is a Ruby on Rails webmail app with the ability to utilise multiple mail servers, customisable display widgets, table-less XHTML, swappable CSS for skinning.
Claros InTouch is a webmail, instant messenger, addressbook, calendar and notes application. Written with usability and enterprise readiness in mind, Claros inTouch aims to fulfill the need for a stable, full featured Ajax messaging application
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