What are some alternatives?
When comparing GoodSync and Syncthing, you can also consider the following products
rsync - rsync is a software application for Unix which synchronizes files and directories from one location...
Dropbox - Online Sync and File Sharing
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Mega - Secure File Storage and collaboration
FreeFileSync - Download the latest FreeFileSync 10.4. FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
Google Drive - Access and sync your files anywhere