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Claws MailGeary
Free

Free and open source under the GPL 3.0 or later.

 Free

The software is free under its open-source licence. Hosting, hardware and external…

Windows, macOS, Linux Linux
  • Opens and searches enormous mail folders without stalling
  • Plugins for PGP, spam filtering, RSS and calendars ship with it
  • Related messages collapse into conversations and full-text search is fast, which makes it pleasant for straightforward…
  • Composes plain text by default; HTML mail sending is deliberately limited
  • The interface is functional and looks like it was designed in 2004
  • It is Linux-only and deliberately minimal, with no built-in encryption, rules engine or calendar.
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0-or-later License: LGPL-2.1
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.