Gmail is a free, advertising-supported email service provided by Google. Users may access Gmail as secure webmail, as well as via POP3 or IMAP4 protocols. Gmail was launched as an invitation-only beta release on April 1, 2004 and it became available to the general public on February 7, 2007, though still in beta status at that time. The service was upgraded from beta status on July 7, 2009, along with the rest of the Google Apps suite.

AfterLogic WebMail Lite
AfterLogic WebMail Lite PHP provides open source webmail front-end for your existing mail server. The fast, clean and modern-looking AJAX user interface makes it easy to access mail and contacts. Users can check, preview, search, view, compose, send and otherwise process mail, use Inbox, Sent...