MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Groupmail - Groupmail is an email marketing platform enabling marketers to create newsletters, track email marketing campaigns and gain insights.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
SmartrMail - SmartrMail is the easiest way to send best practice newsletters and automations for your store
Mailjet - All-in-one email service provider that provides maximum insight and deliverability results for both marketing and transactional emails.