Anti-Spam Agent for Novell NetMail is a replacement for SpamAssassin's spamd. It will tell the NetMail server to send all new email to it for spam checking. If SpamAssassin determines that the email is spam, you can either have it deleted, or have "X-Spam-Flag: YES" added to the message header. This project also includes assistance for others to write their own NetMail agents.
CleanPOP cleans your POP3 mailbox based on your local mbox, so local anti-spam tools can be applied to Web-mail and other non-local clients. After you've downloaded and processed mail from the POP server, CleanPOP logs in and purges email messages which match locally-added spam headers or are older than a configured expiration time. It aims to be safe by not deleting unfetched emails (unlike other email filters), and efficient by checking only new messages. It's also useful for fetchmail users, who have no option to "delete after X days".
Cyrus2Dovecot is a full-featured command line tool for converting the email messages of one or more users from the Cyrus format to Dovecot Maildir++ folders. It allows you to perform a server transition which is fully transparent to both POP and IMAP users, as virtually all available metadata is preserved during the conversion. This includes message UIDs, INTERNALDATEs, IMAP folder subscriptions, the UIDVALIDITY and UIDNEXT values for each folder, as well as all IMAP flags (including the first 26 user-defined keywords).