The free app for your blaucloud.de Cloud Storage, which also works with other ownCloud based Storages.
With the blaucloud.de app you get access and can sync your data with your blaucloud.de Account via your Android Phone. blaucloud.de is a Cloud Storage made in Germany based on ownCloud which offers you 2 GB for free (crypted anonym space with unlimited users). Of course you can use this free app to sync with every other ownCloud instance as well.