Open Source Email & Communication Tools

A curated collection of the best free and open source tools for handling mail and messages, covering encrypted mailboxes, transactional sending, notifications and inbox triage.

Novu

Open-source communication infrastructure that sends product notifications and connects agents to Inbox, email, SMS, push, chat and messaging channels.

Alternative to:

OneSignal

Multi-channel notification infrastructure for apps

Stars
40,214
Forks
4,519
Last commit
18 hours ago

Ntfy

A self-hostable pub-sub notification service that sends alerts to your phone or desktop from any script using plain HTTP requests.

Alternative to:

Pushbullet

Simple, fast, and secure push notifications for all

Stars
35,124

Tuta

An email service with end-to-end encryption built in, with open source clients for mobile, desktop and the browser for privacy-conscious users.

Alternative to:

Google Workspace

Secure email, calendar and contacts with end-to-end encryption

Stars
8,051

Plunk

An email platform combining transactional sending, marketing campaigns and automation, self-hostable for developers who want one tool instead of three.

Alternative to:

Mailgun

The open-source, affordable email platform

Stars
5,554

useSend

Open-source email sending platform built on Amazon SES, covering transactional mail, marketing campaigns, contacts and delivery analytics from a single dashboard.

Alternative to:

Mailgun

Pay per email sent, not for contact storage

Stars
4,762

Freescout

Lightweight PHP help desk and shared inbox that centralizes email, chat and social conversations, a self-hosted alternative to Zendesk and Help Scout.

Alternative to:

Zendesk

Open-source helpdesk for seamless customer support

Stars
4,619

Sendportal

Self-hosted email marketing on Laravel, with subscriber lists, campaigns, tracking, and workspaces, sending through the provider you already use.

Alternative to:

Mailchimp

Self-hosted email marketing with unlimited everything

Stars
2,183

Keila

Send newsletter campaigns and build sign-up forms from a self-hosted Elixir application, an alternative to Mailchimp for privacy-minded senders.

Alternative to:

Mailchimp

Open-source email marketing for the privacy-conscious

Stars
2,254

UnInbox

Open source email built for teams, with shared spaces, per-conversation workflow statuses and unlimited addresses, for anyone drowning in shared inboxes.

Alternative to:

Front

Transform team email into efficient collaborative workflows

Stars
1,760

Sessy

Email observability for Amazon SES, giving you a dashboard of deliveries, bounces, complaints, opens and clicks from your own instance.

Alternative to:

Mailgun

Own your SES email analytics, from send to inbox

Stars
944

DoubleZero

A self-hosted SES dashboard that configures the AWS pipeline for you, then sends and monitors email through a single HTTP API.

Alternative to:

Mailgun

Self-hosted email infrastructure for developers

Stars
1,245

Hyvor Relay

A self-hosted email API that sends through your own SMTP infrastructure, built for developers who need deliverability control and detailed send logs.

Alternative to:

Mailgun

Open-source email API with enterprise deliverability

Stars
918

Twake Mail

Multi-platform email client built on the JMAP protocol, for organizations running Twake Mail or any other JMAP server.

Alternative to:

Gmail

Secure open source email with advanced encryption & AI

Stars
664

AgentMail

The TypeScript SDK for AgentMail, an email inbox API that gives AI agents their own addresses, threads and attachments.

Email inbox API built for AI agents and workflows

Stars
41
Forks
17
Last commit
17 hours ago

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Open Source Email & Communication Tools

A curated collection of the best free and open source tools for handling mail and messages, covering encrypted mailboxes, transactional sending, notifications and inbox triage.

Novu

Ntfy

Tuta

Plunk

useSend

Freescout

Sendportal

Keila

UnInbox

Sessy

DoubleZero

Hyvor Relay

Twake Mail

AgentMail

Novu

Ntfy

Tuta

Plunk

useSend

Freescout

Sendportal

Keila

UnInbox

Sessy

DoubleZero

Hyvor Relay

Twake Mail

AgentMail

Inbox Zero