MagentoXtender .NET Webservice Client is an open source .NET library to connect to the webservice of a Magento Webshop using XML-RPC. This module gives you the ability to create .NET applications which can communicate with a magento webshop.
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