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MerkuroEvolution
Free

Free and open source under the GPL-3.0-or-later licence.

 Free

Free and open source, part of the GNOME project.

Linux Linux
  • Supports Nextcloud, Google Calendar, Outlook and CalDAV calendars
  • Combines events, tasks and contacts in one app
  • Mail, calendar, contacts and tasks in one program
  • Exchange Web Services plugin connects to Microsoft 365
  • Linux only
  • Fits best within the KDE Plasma desktop
  • Linux only
  • Heavier than a mail-only client, and slower to start
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0-or-later License: GPL-2.0-or-later and LGPL-2.1-or-later
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked October 1, 2026

Checked September 21, 2026

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