ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
imapsync - Console-based utility for migrating IMAP mailboxes.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Tutanota - Get your encrypted mailbox for free.
MigrationWiz - MigrationWiz provides on-demand mailbox migration services through a fully automated cloud-based...