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I admit it. I'm something of a sync-geek. I love software that helps me fling files far and wide. I have machines all over the world, doing all sorts of interesting things, and I constantly need to move files hither and yon.
One of my favorite tools for this is SyncBack Pro. This thing has a tremendous number of options and capabilities, can sync locally, to FTP, SFTP, S3, Google storage, and even Microsoft Azure. I use it as the core of my backup strategy, and also use it to keep a wide variety of servers updated with various content bits here and there.
What I like: Easy, reliable, fast, robust, flexible.
What I'd like to see: Easier way to send settings between instances or some centralized management control (which, apparently, is actually in beta).
Find it here starting at about $55.