The Free Web Mail Software SquirrelMail was developed by Nathan and Luke Ehresmanis and features a stable, feature-packed and a fairly configurable email server. To use the software you’ll need a Web Server running PHP, and an IMAP Server to connect to.

This Free Open Source Survey Application software was formerly known as PHPSurveyor and, is an open source PHP survey software to create online surveys. Its features are open/closed surveys, branching, participant administration, quotas, WYSIWYG HTML editor, email invitations & reminders, assessments, basic statistics and more.

gnubiff is a Free Multi Account Email Notifier that checks for mail and displays headers when a new mail has arrived. This software supports various mail servers such as the pop3, apop, imap4, mh, qmail and mailfile. You can  Receive Desktop Alerts on Emails from Multiple Accounts using this software.