Database Replication, Filtered Synchronization, and Transformation
SymmetricDS is database replication and file synchronization software. It is a platform-independent, web-enabled, and database-agnostic synchronization tool. With initial data load, bidirectional change data capture, conflict resolution, and data transformation, it is a comprehensive data replication solution.
To synch and encrypt all sorts of data across different sources
SynchedIn is a portable utility created to enforce realtime or latent synchronization of data (generally files) between different data storage sources.
You can create as many synch configs as you please.
Each synch config specifies a number of data sources, a number of schedulers.
Each scheduler determines when the data sources must be checked for synchronization.
Each data storage source represents a hierarchical (file system ...) or other type of data storage medium. These include...
CalDAV sync for Android
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Stopped working on it. Doesn't make any sense to spend more time on it; I recommend e.g. DAVdroid as an opensource and ready-to-use solution on clientside.
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For code look at:
https://github.com/e7o-de/android.caldav