MailStore - MailStore Home - A 100% free single-private-user desktop solution
Pipedrive - Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.
Got Your Back - Got Your Back (GYB) is a command line tool that backs up and restores your Gmail account.
Zoho CRM - Omnichannel CRM for Businesses of all sizes
SysTools Gmail Backup - Backup Gmail Emails, Contacts, Calendar, and Google Drive Storage File by SysTools Gmail Backup Solution
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.