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vdirsyncerDavMail
Free

Free and open source.

 Free

Free and open source under the GPL-2.0 licence, with optional donations.

macOS, Linux, Command line Windows, macOS, Linux, Self-hosted
  • Two-way sync for CalDAV and CardDAV
  • Keeps calendars and contacts as local files
  • Covers mail, calendar, contacts and directory in one gateway
  • Works with on-premises Exchange and Exchange Online
  • Command line only, with no graphical interface
  • Needs a configuration file before first use
  • Requires configuring each client to use the gateway
  • Java application rather than a native interface
Downloadable app Downloadable app, Self-hosted
Open source Open source
License: BSD-3-Clause License: GPL-2.0
No account needed Not stated if an account is needed
Works offline Needs internet

Checked October 2, 2026

Checked October 1, 2026

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