Zoho One is a all-in-one suite to run your entire business. It includes CalDAV calendars and CardDAV contacts.
CalDAV Base URL:
CardDAV Base URL:
User name and pasword: your Zoho email address and password
CardDAV: VCard contact groups are not supported. Choose the method used by your other clients or "per-contact categories" to minimize potential problems.
CalDAV: VTODO tasks don't seem to be supported by Zoho.