MailStore - MailStore Home - A 100% free single-private-user desktop solution
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
Gmvault - Backup the emails in your Gmail account.
Soonr - Soonr is a cloud-based document storing and file sharing system for the small and medium-size businesses.
SysTools Gmail Backup - Backup Gmail Emails, Contacts, Calendar, and Google Drive Storage File by SysTools Gmail Backup Solution
Nubo - A self-hosted file sharing application in Haskell.