imapsync - Console-based utility for migrating IMAP mailboxes.
V12 Data - V12 Data offers rich data sets with verified addresses and emails for personalized marketing campaigns.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Adobe Audience Manager - Adobe Audience Manager is a data management platform that integrates online and offline data to deliver a unified view of all your audiences
MigrationWiz - MigrationWiz provides on-demand mailbox migration services through a fully automated cloud-based...
Google Audience Center - 3 votes and 6 comments so far on Reddit