Round cube webmail is a browser based multilingual IMAP email client. The interface is familiar like desktop application. The application have features viz MIME support, folder manipulation, address book, message searching spell checking etc. The application is open source so any one can download and install. The requirement is apache with PHP module, libraries like PEAR and IMAP wrapper from IlohaMail.org and database as MySQL or Postgres. The user interface is heavily configurable since it uses XHTML and CSS.
The application is licensed under GNU General Public License (GPL) so anyone can download, deployed and re-distribute. The application is still under development new releases are available after beta testing.