GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
ExpanDrive - ExpanDrive is a fast network drive and browser for cloud storage.
FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
FileCloud - FileCloud is an enterprise file share, sync and mobile access solution.