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DAVdroid is the only all-in-one synchronization solution for both contacts and calendars based on WebDAV (CardDAV and CalDAV). The app is easy to set up and integrates perfectly with your favorite calendar/contacts app (including default apps). It can also be used seperately, if you either have CalDAV or CardDAV.
After installing the app, there will be a new account type "DAVdroid". Add a DAVdroid account using Settings/ Accounts/ Add account to enter your server. See http://davdroid.bitfire.at/configuration for help.
⊛ Use DAV calendars (CalDAV) and address-books (CardDAV) in a single app ⊛ Two-way synchronization (server ↔ client) ⊛ Native Android 4+ implementation ⊛ Flawless integration with your device and favorite apps ⊛ Easy setup (resource auto-detection) ⊛ Fast algorithms for high performance (CTag/ETag support) ⊛ Optimized for phones and tablets ⊛ Out-of-the-box support for Android 4.3 ⊛ ... and finally – it's open source!
Get the best out of this app ... ⊛ ... when using with your own DAV server (Radicale, DAViCal, SabreDAV, Baikal, …) and HTTPS – so you own and control all your data while having the comfort of synchronization between various devices. Or use a hosted DAV service you trust or the one of your company. ⊛ ... and combine it with Evolution / Lightning / etc. on your laptop / PC
Why is it secure? ⊛ Source code is available (see homepage) ⊛ No need for giving your contacts/calendars to Facebook, Google, etc. Use your own server (or a trusted one)! ⊛ SSL is recommended to protected your communication so synchronization is secure even when using open Wi-Fi networks.
What's New ⊛ Adds support for .well-known URLs (RFC 5785) → This allows to combine CalDAV/CardDAV for OWNCLOUD IN ONE ACCOUNT! See lines with ".well-known" in http://doc.owncloud.org/server/6.0/admi ... ource.html → This also allows MUCH SIMPLER ICLOUD SETUP: Just add one account for "caldav.icloud.com" (and your Apple ID) and another account for "contacts.icloud.com" (and your Apple ID) ⊛ Handles HTTP redirections ⊛ Minor bug fixes and improvements