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.
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.
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
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.
Mailjet - All-in-one email service provider that provides maximum insight and deliverability results for both marketing and transactional emails.