MailStore
imapsync
Gmvault
Cryoserver
Mail Backup X
Intradyn Email Archiver
Hornetsecurity Email Archiving
Piler
MigrationWiz
imapsync
audriga Email and Groupware migration
OfflineIMAP
Cloudiway
IMAPSize
isync (mbsync)
Gmvault
MailStoreimapsync - Console-based utility for migrating IMAP mailboxes.
Gmvault - Backup the emails in your Gmail account.
audriga Email and Groupware migration - Easily migrate your email, contacts, calendar items and tasks to your new provider or server. No software installation is required.
Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.
OfflineIMAP - OfflineImap synchronizes email between an IMAP server and a MailDir or between two IMAP servers.
Mail Backup X - Your one stop mail backup and archiving tool for Mac.