Groundhogg - CRM & marketing automation for WordPress
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
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.
Kingmailer - Kingmailer helps you send, receive and route/forward emails.
ActiveCampaign - Integrated email marketing, marketing automation, and small business CRM. Send beautiful newsletters, setup behavioral based automations, and benefit from sales automation.
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.