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listmonk is a self-hosted manager for one-way newsletters and mailing lists. It supports single- and double-opt-in subscribers, SQL-based segmentation, and analytics for campaign performance, bounces, and top links. Its templates can use Go expressions and functions, drag-and-drop, WYSIWYG, Markdown, HTML, or plain text. REST-like APIs expose dashboard features, and predefined templates can send transactional messages through email, SMS, and WhatsApp interfaces. It is free…
phpList is an email platform for sending newsletters, marketing campaigns, announcements, and notifications to audiences from hundreds to millions.

SourceHut is a suite of open source development tools offered as a hosted service or for self-hosting.