DAVx⁵

CalDAV/CardDAV-Synchronisierung und -ClientGPL-3.0-only

Infomaniak kSync

Synchronisieren Sie automatisch Ihre Kontakte und KalenderGPL-3.0-only

TaskDav

Tasks, notes and calendar over CalDAV — or local-only on your phone.GPL-3.0-only

Seca Contacts

Private contacts: coloured profiles, duplicate merging, no Internet accessGPL-3.0-or-later

DavNotes

Simple notes synced with your own CalDAV server, such as RadicaleMIT

Conversations

Encrypted, easy-to-use XMPP instant messenger for your mobile deviceGPL-3.0-only

DecSync CC

Sync contacts, calendars and tasks without a server using DecSyncGPL-3.0-only