ownCloud is a popular open source enterprise web application used for data synchronization and file sharing. It allows users to easily manage their files, contacts, calendars, to-do lists, and more, making it a great alternative to to the popular Google Drive, Dropbox, iCloud, etc. cloud platforms. ownCloud is a cross-platform application and supports all popular operating systems, but this tutorial was written especially for Ubuntu 16.04. At the time of writing the latest ownCloud version is 10.0.7.