imapsync - Console-based utility for migrating IMAP mailboxes.
Metalogix Archive Manager - Archive, manage, and secure your organization's email with archiving software designed specifically for Exchange.
Gmvault - Backup the emails in your Gmail account.
Imagen - Imagen enables content owners to secure, publish and monetise small and large media archives.
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.
ArchiveSocial - The #1 provider of social media archiving for government, law enforcement, and K-12 agencies. ArchiveSocial is trusted by more than 2,000 agencies for social media archiving and public records compliance.