Roundcube is an Open Source Multilingual Web Mail Application. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking.

This free and open source webmail solution with a desktop-like user interface, is easy to install/configure and that runs on a standard LAMPP server. The skins use the latest web standards such as XHTML and CSS 2. Roundcube includes other open-source libraries such as PEAR and the IMAP wrapper from IlohaMail.org.
Features
- Drag-&-drop message management
- Richtext/HTML message composing
- Built-in caching for fast mailbox access
- Template system for custom skins
- Plug-in API for flexible extensions
- Available in 65 languages
Website: http://roundcube.net/
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