Billionmail
BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr
notifo-io
Multi channel notification service for collaboration tools, e-commerce, news service and more.
foundation
An email framework that converts simple HTML into responsive email-ready HTML.