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Evolution vs KOrganizer: catalog facts
Evolution	KOrganizer
Free Free and open source, part of the GNOME project.	Free Free and open source from the KDE community.
Linux	Linux
Mail, calendar, contacts and tasks in one program Exchange Web Services plugin connects to Microsoft 365	Works with Nextcloud, Kolab, Google Calendar and CalDAV servers Integrated to-dos alongside the agenda view
Linux only Heavier than a mail-only client, and slower to start	Best suited to the KDE Plasma desktop Depends on the Kontact/Akonadi stack
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later and LGPL-2.1-or-later	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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