Synkron is an open source, cross-platform application that makes it easy to keep your files and folders in sync between multiple computers and devices. It can be used to synchronize data between a desktop computer and laptop, a laptop and a tablet, or any combination of computers, phones, and other devices. Synkron can be configured to automatically sync files when a device is connected to the same network, or it can be scheduled to sync on a regular basis. It is designed to be simple to use, yet powerful enough to provide a wide range of options for customizing the sync process. It also supports advanced features for keeping multiple versions of files, synchronizing over multiple networks, and more. The app is available for Windows, Mac OS, and Linux, and can be accessed from the web or a mobile app.
Unison is what Synkron wants to be. It actually compares the contents of files and sends data over the network, rather than just looking at modification time.