Celeste

Celeste is a GUI file synchronization client that can connect to virtually any cloud provider.

Features:
- Two-way sync
- Asking what to do when a local and remote file have both been updated since last sync
- Ability to exclude files/folders from sync
- Connecting to multiple cloud providers at the same time

Supported cloud providers:
- Dropbox
- Google Drive
- Nextcloud
- Owncloud
- pCloud
- Proton Drive
- WebDAV