Best Open Source Email Clients using CSS in 2026

Zero

Privacy-first email client with AI-powered organization

Stars
10,529
Forks
1,293
Last commit
8 months ago

An open source email application that combines AI capabilities with robust privacy features to help manage and organize your inbox efficiently.

Open Source Alternative to:

Gmail

UnInbox

Transform team email into efficient collaborative workflows

Stars
1,719
Forks
129
Last commit
2 months ago

Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.

Open Source Alternative to:

Microsoft Teams

Twake Mail

Secure open source email with advanced encryption & AI

Stars
606
Forks
119
Last commit
2 hours ago

Open source professional email solution with PGP encryption, JMAP protocol, AI-powered responses, and advanced antispam protection. Control your data privately.

Open Source Alternative to:

Gmail

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Zero

Privacy-first email client with AI-powered organization

Stars
10,529
Forks
1,293
Last commit
8 months ago

An open source email application that combines AI capabilities with robust privacy features to help manage and organize your inbox efficiently.

Open Source Alternative to:

Gmail

UnInbox

Transform team email into efficient collaborative workflows

Stars
1,719
Forks
129
Last commit
2 months ago

Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.

Open Source Alternative to:

Microsoft Teams

Twake Mail

Secure open source email with advanced encryption & AI

Stars
606
Forks
119
Last commit
2 hours ago

Open source professional email solution with PGP encryption, JMAP protocol, AI-powered responses, and advanced antispam protection. Control your data privately.

Open Source Alternative to:

Gmail

Open Source Email Clients using CSS

A curated collection of the best open source desktop or web applications for managing email. using CSS.

Zero

UnInbox

Twake Mail

Zero

UnInbox

Twake Mail