imapsync - Console-based utility for migrating IMAP mailboxes.
isync (mbsync) - mbsync is a command line application which synchronizes mailboxes.
mnIMAPSync - mnIMAPSync - Java IMAP email syncing tool
MigrateCloudData IMAP Mail Backup Tool - A trusted software with better designs and functions to perform the backup and migration of IMAP emails.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
MCT IMAP Migration Tool - IMAP Migration Tool is the top-notch utility to backup and migrates the IMAP emails.