Open Source Email Clients
A curated collection of the best open source desktop, mobile, and web applications for reading and managing email, with multi-account support, search, and encryption..
Keyboard-first email client with AI, chat, and tasks
Stars
Stars growing quickly over the last 30 days6,333Last commit
6 hours agoLicense
AGPL-3.0
An AI-powered email client that combines inbox management, chat, tasks, and AI agents in one shared workspace, built for keyboard-driven workflows.
Open Source Alternative to:
Native desktop email with tracking, templates, and dark mode
Stars
18,013Last commit
1 day agoLicense
GPL-3.0
Desktop email client for Mac, Windows, and Linux with unified inbox, read receipts, link tracking, send later, grammar checking, and contact enrichment.
Open Source Alternative to:
AI email assistant that automates, organizes, and declutters
Stars
Stars growing over the last 30 days13,034Last commit
19 hours agoLicense
AGPL-3.0
Automates Gmail and Outlook with AI-drafted replies, bulk unsubscribe, cold email blocking, attachment filing, and inbox analytics for individuals and teams.
Open Source Alternative to:
Privacy-first email app for Android, no ads ever
Stars
14,226Last commit
1 day agoLicense
Apache-2.0
Android email client from the Thunderbird project with unified inbox, multiple account support, OpenPGP encryption, and no ads or data tracking.
Open Source Alternative to:
Browser-based IMAP webmail with a full email client feel
Stars
7,279Last commit
4 days agoLicense
GPL-3.0
PHP-based webmail client with MIME support, address book, folder management, threaded views, PGP encryption, and a plugin API for self-hosted email.
Open Source Alternative to:
Transform team email into efficient collaborative workflows
Stars
1,760Last commit
9 months agoLicense
AGPL-3.0
Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.
Open Source Alternative to:
Secure open source email with advanced encryption & AI
Stars
668Last commit
2 days agoLicense
AGPL-3.0
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:
Stellar Hosted – Managed Open Source software hosting in the EU: secure, compliant, fast.
Windshift