Open-source Marketing Automation tools

The best open-source Marketing Automation tools, curated: 5 in the registry, including Billion Mail, Dittofeed, Plunk. Every tool is open-source; each entry lists license, self-hostability, and links.

5 tools · ← all categories · JSON

• Billion Mail · tool, 2026-09-13
  Fully self-hosted, open-source (AGPL-3.0) email server and email-marketing platform: newsletters, campaigns and transactional mail on your own server, free of monthly per-subscriber fees. Vendor claims an 8-minute install to first sent email. An open alternative to Mailchimp (~15.6k stars).
• Dittofeed · tool, 2026-09-03
  OSS alt to Customer.io; ~2888 stars; via openalternative.co
• Plunk · tool, 2026-09-03
  OSS alt to Resend; ~5347 stars; via openalternative.co
• Sendune · tool, 2026-09-03
  OSS alt to Resend; ~2182 stars; via openalternative.co
• useSend · tool, 2026-09-03
  OSS alt to Resend; ~4586 stars; via openalternative.co