Cloud storage & sync

Here is a list of open-source alternatives to Dropbox, Google Drive, Microsoft OneDrive, iCloud Drive (keeping files in sync across devices), from Open Source Everything (CC BY-SA 4.0): - Nextcloud (AGPL-3.0, https://github.com/nextcloud/server; replaces fully): Nextcloud Server is software you install on your own server to store, sync and share your files, contacts and calendars. It is aimed at people and organisations who want to host their own cloud storage instead of using a commercial provider. - Seafile (GPL-2.0, https://github.com/haiwen/seafile; replaces fully): Seafile is open-source file storage that syncs folders across your devices and lets you share files with others. It is aimed at people and teams who want to keep control of where their files are stored. - ownCloud Infinite Scale (Apache-2.0, https://github.com/owncloud/ocis; replaces fully): ownCloud Infinite Scale is a self-hosted file sync and share platform that stores your files on your own server. It is for people and teams who want to keep their files in sync across devices without relying on a commercial cloud provider. - Syncthing (MPL-2.0, https://github.com/syncthing/syncthing; replaces partly): Syncthing keeps folders of files matching across two or more of your computers directly, without storing them in a cloud service. It is for people who want to sync their own files privately and without a company in the middle. - Filestash (AGPL-3.0, https://github.com/mickael-kerjean/filestash; replaces partly): Filestash is a web-based file manager that lets you browse and manage files stored in many places, such as SFTP, S3, SMB or WebDAV servers, from one browser window. It also offers sync clients for computers and phones, aimed at people who want to keep their files in their own storage. - Owncloud (AGPL-3.0, https://github.com/owncloud/core; replaces partly): ownCloud Core is the server part of ownCloud Classic, which stores, syncs and shares files. It is for people and organizations who want to run their own file storage on a server they control. Compare it with my project or idea below. Tell me which projects overlap, what I could reuse instead of rewriting, and what mine does that none of them do. My project or idea: