IMP, the Internet Mail Program, is one of the most popular and widely deployed
open source webmail applications in the world. It allows universal, web-based
access to IMAP and POP3 mail servers and provides Ajax, mobile and traditional
interfaces with a rich range of features normally found only in desktop email
clients. For more information on IMP, visit http://www.horde.org/apps/imp.

WWW: https://www.horde.org/apps/imp/