MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
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.
Mailman 3 - Dedicated Mailman 3 installation. Unlimited lists/configuration. Free subdomain at mailman3.com. Dedicated support for list admins.
EZ Texting - EZ Texting provides SMS marketing solutions to businesses of all sizes.
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.