Seafile

Seafile organizes files into libraries, each of which syncs separately and can be encrypted with a password its owner chooses. That unit is what separates it from a single mirrored folder: you decide per library what lands on a given machine and what stays encrypted at rest.

Syncing transfers only the content delta, and interrupted transfers resume where they stopped. Conflicts are resolved from file history rather than timestamps, any folder can sync selectively, and a client can sync against two or more servers or adopt a folder that already exists. The drive client exposes everything as a virtual disk and fetches files on demand.

Past sync and share, the server carries collaboration features.

• Sharing: folders go to users or groups, with password-protected download links and upload links for outsiders.
• Metadata: extensible properties such as owner, deadline and status, plus file tags with a parent and child hierarchy.
• Views: one library can be read as a table, a Kanban board, a gallery, a map or a statistics view.
• Editing: OnlyOffice and Collabora integrate for office documents, and SeaDoc is the built-in collaborative editor.
• Knowledge bases: a built-in wiki, with Excalidraw wired in for collaborative whiteboards.

This repository is the sync client daemon, which remains the project's front page on GitHub. Server core, web interface, mobile clients and WebDAV each live in their own repository, and the license differs by component, from GPLv2 here to AGPLv3 for the server.