Acrosync – Native Windows Implementation of Rsync [↗]
Acrosync for Windows can sync entire folders with any Linux/Mac/NAS without installing server software. That is because it is the only native Windows implementation of rsync, a powerful folder sync tool that is ubiquitously installed by default in the non-Windows world.
Worth a look for when you are stuck on a Windows machine and you wished you had rsync available. It’s not free, but it does come with a 15-day trial.