Try SysTools Gmail Backup tool to export Gmail emails, contacts, calendars and Google drive storage files into multiple file formats. This tool also takes the backup of Google Docs / Spreadsheets / Slides / Images. For more info, visit its official website: https://www.systoolsgroup.com/gmail-backup.html
Gmvault - Backup the emails in your Gmail account.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
Got Your Back - Got Your Back (GYB) is a command line tool that backs up and restores your Gmail account.
GetResponse - Email marketing from GetResponse. Send email newsletters, campaigns, online surveys and follow-up autoresponders. Simple, easy interface. FREE sign up.