MailStore - MailStore Home - A 100% free single-private-user desktop solution
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.
SysTools Gmail Backup - Backup Gmail Emails, Contacts, Calendar, and Google Drive Storage File by SysTools Gmail Backup Solution
Got Your Back - Got Your Back (GYB) is a command line tool that backs up and restores your Gmail account.
Intradyn Email Archiver - Orca Email Archiver provides email archiving solution for local government and business.
Gmvault - Backup the emails in your Gmail account.