Mover - Mover is a platform for moving files, streamlines the process of transferring users' data to the cloud.
imapsync - Console-based utility for migrating IMAP mailboxes.
WANdisco Fusion Platform - WANdisco Fusion is a data replication product for Hadoop.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
ShareGate Desktop - Cloud Migration
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.