Webmail is a email client based on web and implemented as a web application running on a web server. There are several free webmail client scripts are available.
Roundcube is a free and open source browser based webmail client for LAMPP server. It is a multilingual IMAP client with over more than 70 languages.It is available under the GNU General Public License version 3. It comes with Modern user interface and Drag-&-drop message management. It supports IDNA, IMAP and the external SMTP server. It run on webservers like Apache, Nginx, Lighttpd, Hiawatha or Cherokee with MySQL, PostgreSQL and SQLite databases. It also provide strong privacy protection.
Some other features are Canned response templates,Multiple sender identitiesm, Spell checking, Built-in caching for fast mailbox access and Import/export functions.