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Open Source Email Clients using Testing Library

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. using Testing Library.

Macro Mail

Keyboard-first email client with AI, chat, and tasks

  • Stars

    Stars growing quickly over the last 30 days5,817

  • Last commit

    7 hours ago

  • License

    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:

Gmail

Mailspring

Native desktop email with tracking, templates, and dark mode

  • Stars

    17,969

  • Last commit

    7 hours ago

  • License

    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:

Apple Mail
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