Sales & marketing · Updated October 2026
Mailchimp is an email marketing service for newsletters and campaigns. If you would rather own your tools, here are 5 open source alternatives to Mailchimp, ranked by GitHub stars. Each one is free to use under its license, and you can read, change, and often self-host the code.
The most popular is listmonk with 23.9k stars, and the most recently updated is Plunk, with a commit on Oct 21, 2026.
| Project | Stars | License | Language | Last commit |
|---|---|---|---|---|
 listmonk | 23.9k | AGPL-3.0 | Go | Oct 21, 2026 |
 BillionMail | 15.9k | AGPL-3.0 | Go | Jun 11, 2026 |
 Mautic | 10.8k | Other | PHP | Oct 21, 2026 |
 Plunk | 5.5k | AGPL-3.0 | TypeScript | Oct 21, 2026 |
 useSend | 4.7k | AGPL-3.0 | TypeScript | Oct 18, 2026 |
by knadh
High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app.
by 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
by mautic
Mautic: Open Source Marketing Automation Software.
by useplunk
The Open-Source Email Platform
by usesend
Open source alternative to Resend, Sendgrid, Postmark etc.
By GitHub stars, listmonk is the most popular open source alternative to Mailchimp right now, with 23.9k stars, followed by BillionMail and Mautic. The best fit depends on your setup, so compare their licenses, languages, and recent activity in the table above.
Yes. All 5 projects on this page are open source, so the software itself is free to use, study, and change. Some of them also sell a hosted version or paid support.
Plunk (last commit Oct 21, 2026), Mautic (last commit Oct 21, 2026), and listmonk (last commit Oct 21, 2026) have the most recent commits. Licenses on this list include AGPL-3.0.
