imap cleanup & command line tool
an 'auto-reply' bot for your mail server
Encrypting E-Mail Client
To synch and encrypt all sorts of data across different sources
javascript to convert thunderbird/seamonkey filters to sieve rules
A free .NET library for accessing IMAP servers, written in C#
Keep up to date with your mail! Notifications, easy configuration.
Postfix + Courier + Mysql Admin Webfrontend