SparkleShare is an open source cloud storage, file synchronization and collaboration client application that uses Git as the storage backend. Think of it as Dropbox, but using your own Git server, or a hosted solution like GitLab, GitHub or BitBucket.
The application runs on Windows, Linux and macOS (there are no mobile apps), and its main use cases include synchronizing frequently changing project files, or tracking and syncing files edited by multiple people, all with an easy way of reverting the files to any point in their history, and optional client side encryption.