High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app.

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

A free simple responsive HTML email template

Mautic: Open Source Marketing Automation Software.

Self hosted newsletter app

Drag-n-Drop Email Editor Component for React.js

EspoCRM – Open Source CRM Application

The modern email development framework.

✉️ An awesome list of resources to build better emails.

📢 Laudspeaker is an Open Source Customer Engagement and Product Onboarding Platform. Open Source alternative to Braze / One Signal / Customer Io / Appcues / Pendo . Use Laudspeaker to design product onboarding flows and send product and event triggered emails, sms, push and more.

Agentic Email Automation Tool: Describe your product. Define your target market. The AI finds the leads for you.

120 marketing skills + 8 commands for Claude Code & AI agents across 7 disciplines — SEO/GEO, influencer, paid ads, email, product launch, organic social & brand narrative — on one shared contract, with 8 auditor gates: CORE-EEAT · CITE · STAR · ROAS · SEND · RAMP · ECHO · TALE.

Open-source self-hosted email marketing. Manage your own newsletters at a fraction of the cost.

AI Marketing Suite for Claude Code. 15 marketing skills with parallel subagents — audit any website, generate copy, email sequences, ad campaigns, content calendars, competitive intelligence, and client-ready PDF reports.

Mosaico - Responsive Email Template Editor

A free and open-source block-based email template builder.

The modern email development framework.

Free HTML email templates for Mailchimp and other emails services

Awesome Opensource Email Resources

33 battle-tested marketing skills for OpenClaw agents — Powered by MyClaw.ai