Best Open-Source Email Clients & Productivity

9 tools found

K-9 Mail

K-9 Mail is an open-source Android email client that replaces Microsoft Outlook with direct IMAP synchronization and zero cloud-proxy data logging.

14.2kandroidtoday

Apache-2.0Email Clients & Productivity

Thunderbird

Thunderbird is an open-source email client replacing Microsoft Outlook with unified inboxes, native CalDAV calendar sync, and zero subscription costs.

14.2kLinuxmacOSWindowstoday

Apache-2.0Email Clients & Productivity

Inbox Zero

Open-source AI email assistant to replace Fyxer and Lindy with self-hosted inbox triage, plain-English automation rules, and local privacy.

12.9kWebtoday

AGPL-3.0Email Clients & Productivity

Zero

Zero is an open-source, self-hosted alternative to Gmail that combines PostgreSQL storage with automated AI triage and conversational inbox search.

10.9kDockerLinux8d ago

MITEmail Clients & Productivity

Mailpile

Mailpile is a self-hosted email client offering local search and OpenPGP encryption, replacing cloud webmail with private, user-managed mailboxes.

8.8kLinuxmacOSWindows3y ago

AGPL-3.0Email Clients & Productivity

Roundcube

Roundcube provides self-hosted open-source webmail for IMAP servers, replacing costly Microsoft Outlook seats with clean browser-based message triage.

7.3kLinuxmacOSWindows9d ago

GPL-3.0Email Clients & Productivity

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