Syncthing — #1 Alternative to Dropbox
Continuous, decentralized peer-to-peer file synchronization with zero cloud intermediaries
Synchronizes folders directly between your laptops, desktops, NAS, and phones over TLS 1.3 block exchange—unlimited devices, unlimited terabytes, zero monthly fees.
License: MPL-2.0 · Pricing: Free & Open Source · Compare all Dropbox alternatives · Official Website