Best way to synch files across the internet? Free tools? [duplicate]

Best way to synch files across the internet? Free tools? [duplicate]

I need to be able to synch files across the internet, preferably in a transparent way (i.e. via a service), though that that isn't a necessity. DropBox is no good - not enough space and it forces you to store things within its own hierarchy. Plus I have no need for internet storage - all storage will be on my own machines sitting in my LANs.