Spamato is a spam filter system that combines several anti-spam techniques, from which thousands of users benefit. It is available as an add-on for Thunderbird and Outlook, and as a stand-alone proxy for other email clients. IMAP and POP are supported.
Koolwired.Imap is a fully managed .NET IMAP client library written in C#.
CreativixDB is a new database format based on the growing internet standard xml. within that, this project contains an sql interface for this database written for php, .net programs, office and java. the main great target is to create a groupware solution
A better Webmail Interface for MailEnable.