Top Alternatives to grsync

FreeFileSync is a free open source backup software which helps you compare and synchronize files and folders on Windows, Linux and macOS.

rsync is a utility for efficiently transferring and synchronizing files across computer systems, by checking the timestamp and size of files.

Duplicati is a backup tool, not a file sync tool.

SyncToy is a freeware tool in Microsofts PowerToys series that provides an easy-to-use graphical user interface for synchronizing files and folders in Windows versions XP, Vista and 7. It is written using Microsofts .NET framework and uses the Microsoft Sync Framework.

GoodSync is a backup and file synchronization program. It is used for synchronizing files between two directories.

Synkron is a multiplatform Qt application designed for synchronizing two or more folders. It is written in C++ and uses the Qt4 libraries. Synkron is distributed under the terms of the GPL v2.

Unison is a file-synchronization tool for OSX, Unix, and Windows. It allows two replicas of a collection of files and directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other.

Allway Sync is backup and file synchronization software that allows backing up and synchronizing files to the same or different drives, to different media (CD, DVD, Flash, zip), or to a remote server.

DirSync Pro is an open source synchronization and backup utility for Windows, Linux, macOS, and all other operating systems that run Java.

PureSync is a Windows program to synchronize files and folders, and to do backups automatically in the background.

Qtd Sync is a backup client and server.