Sync contacts between ownCloud and countless other apps
ownCloud is free software for storing data (file hosting) on your own server. If a corresponding client is used, it is automatically synchronized with a local directory. This means that a consistent database can be accessed from several computers. The project was launched in January 2010 to create a free alternative to commercial cloud service providers. Unlike commercial storage services, ownCloud can be installed on a private server or web space. In this way, concerns about data transfer and the associated relinquishment of control over the data can be dispelled, especially in the case of sensitive data.
App is available.