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Eventix vs Thunderbird: catalog facts
Eventix	Thunderbird
Free Free and open source under the GPL-3.0-or-later licence.	Free Free forever, funded by donations.
Linux	Windows, macOS, Linux, Android
Handles both events and tasks Syncs with CalDAV and Microsoft 365 (Exchange)	Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four
Linux only Small project with few users	The interface carries a lot of history and can feel dense next to a webmail tab Major ESR releases have historically been disruptive for add-ons and settings
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 20, 2026

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