Email Open Source Tools

Alternative toSubstack

Launch a newsletter or paid membership site on your own server

• 55,574 GitHub stars
• MITLicence MIT
• #CMS

Alternative toCourier

Open source notification infrastructure for product teams

• 40,175 GitHub stars
• MITLicence MIT

Alternative toMailchimp

High-performance newsletter and mailing list manager

• 23,880 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Email

Alternative toZendesk

Helpdesk and ticketing on PHP/Symfony with workflow automation

• 19,594 GitHub stars
• OSL-3.0Licence OSL-3.0

Alternative toHubSpot Marketing Hub

Self-hosted marketing automation with email and campaigns

• 10,806 GitHub stars
• GPL-3.0Licence GPL-3.0
• #Email

Alternative toSuperhuman

Self-hosted email client with AI agent on Cloudflare Workers

• 8,127 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toSendGrid

Transactional email, campaigns, and automations on one contact list.

• 5,526 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Email

Alternative toFastmail

Self-hosted email inbox for custom domains on Cloudflare

• 5,117 GitHub stars
• AGPL-3.0Licence AGPL-3.0

Alternative toNotion

The open source workspace, one app for all your work.

• 4,782 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Email

Alternative toSalesforce Sales Cloud

Self-hosted open source CRM for contacts and pipelines

• 3,503 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #CRM

Alternative toMailchimp

Send newsletters and track analytics from your own email server

• 2,239 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Email

Alternative toFront

Open source collaborative email with shared team inboxes

• 1,758 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Email