FaveNest
Save links, notes, photos, and files in a private library
File sync
Keep selected files aligned across devices or locations by propagating changes between copies.
Rune
Keep a shared scratch file across Macs without losing edits
Yuzu Sync
Synchronize Mac folders with disks, servers, and your own storage
Skymir
Mirror Google Drive files through a native Linux desktop client
Total Commander
Browse and compare files in a two-pane Windows file manager
Filen
Sync encrypted files across devices, with notes and chats in the same account
Dropbox
Store, sync, and share files across devices
pCloud
Cloud storage for files, backups, and sharing
Synology
Network storage for files, backup, and shared access