Followup.cc - FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.

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.

FollowUpThen - The simplest way to schedule an email reminder

Gmvault - Backup the emails in your Gmail account.

Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.

imapsync - Console-based utility for migrating IMAP mailboxes.