FreePOPs is a webmail to pop3 conversion daemon. It is extensible to support other webmail using the scripting language LUA. See the homepage for supported webmails.
liberopops is useful for users of Libero provider who cannot read email due to its change of policy.
It acts as a POP3 server which interfaces itself to the webmail service still available.
Diom Webmail is a webmail client written in PHP to interact with an IMAP server. Diom Webmail is easily configurable, with common features like sending and recieving messages and attachements, as well as an address book, and spell check.
Rolodap is a LDAP based contacts directory/manager. It uses a shared directory, but presents itself to users as a series of individually defined address books.Simplicity of end use is a primary goal. Rolodap integrates with emailers that support LDAP.