Apps 
DAVxâµ (formerly known by another name) is the only all-in-one synchronization solution for your s (CardDAV), calendars (CalDAV) and your tasks (based on VTODO). The app is easy to configure and integrates perfectly with your favorite calendar / s app (including the default apps). It can also be used separately, if you have CalDAV, CardDAV or just tasks.
Characteristics:
* Synchronize your DAV calendars (CalDAV) and your address books (CardDAV) and tasks in a single application
* Bidirectional synchronization (server ↔ client)
Implementation Native implementation of Android 4+
* Perfect integration with your favorite device and apps
* Easy configuration (automatic resource detection, for self-signed certificates, authentication by client certificates)
* Fast algorithms for high performance (CTag / ETag, limits the synchronization time range for past events)
* Optimized for phones and tablets
ed Android
{.50 and UP}
ed Android Version:-
Lollipop (5.0–5.0.2) – Marshmallow (6.0 – 6.0.1) – Nougat (7.0 – 7.1.1) – Oreo (8.0-8.1) – Pie (9.0)
