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EvolutionKMail
Free

Free and open source, part of the GNOME project.

 Free

Free and open source under the GPL.

Linux Linux
  • Mail, calendar, contacts and tasks in one program
  • Exchange Web Services plugin connects to Microsoft 365
  • OpenPGP and S/MIME encryption integrated rather than bolted on
  • Shares contacts and calendar with the rest of the Kontact suite
  • Linux only
  • Heavier than a mail-only client, and slower to start
  • Depends on the Akonadi storage service, which is a common source of problems
  • Linux only in practice
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0-or-later and LGPL-2.1-or-later License: GPL-2.0
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.