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Hacker Newsletter - Best of Hacker News in your inbox every Friday.
Mailtrain - Self-hosted open-source Mailchimp clone
Paperplane - High quality HTML to PDF conversion API for developers.
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Why is this interesting? - Every weekday Noah Brier & Colin Nagy (and friends) send an email about something interesting.
Kill the Newsletter! - Convert newsletters into RSS feeds