Notifuse is an open-source & modern emailing platform
Anti-Spam SMTP Proxy Server implements multiple spam filters
Open source Fax server software for inbound / outbound internet Faxing
software for email automation (newsletters, transaction mails, etc.)
Python API for Sendmail Milters.
Multi-protocol server written in Java
Multi user address book application accessable through the web.
Business webmail modular application with mobile client
Multiple account (or label) Gmail notifier (without storing passwords)
Conversation manager