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.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
FollowUpThen - The simplest way to schedule an email reminder
Hornetsecurity Email Archiving - Hornetsecurity Email Archiving is one of the advanced software that offers long-term, unchangeable, and secure storage of important company information, data, and flies.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
Intradyn Email Archiver - Orca Email Archiver provides email archiving solution for local government and business.