Minutemailer - Email Marketing. Simplified.
imapsync - Console-based utility for migrating IMAP mailboxes.
Mailmeteor - Send hundreds of personalized emails with Gmail.
audriga Email and Groupware migration - Easily migrate your email, contacts, calendar items and tasks to your new provider or server. No software installation is required.
Visual Marketing Automation - An insanely fast automation builder by ConvertKit
MailStore - MailStore Home - A 100% free single-private-user desktop solution