GNU Mailman is a mailing list management software. Mailman project was started long time ago before the Millennium. Since its birth it has become the most intelligent tool for handling mailing lists ever. Huge number of companies with Fortune 500 members among them have been using Mailman for years. The new version Mailman 3 brings to us even better user experience and communication power.
Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Criteo - Build, scale, and activate first-party audiences with The Commerce Media Platform.
Sympa - Sympa is an open source (GNU GPL) mailing list management (MLM) software.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.