If you're prepared to make a few additions to httpd.conf you get running with this Python3 technology to do file-sync using Subversion as the backing store. It doesn't require any client side Subversion install, but does Python and some pips. At least up until I make an installer.
And I've yet to make a Window-tray or Mac-menu icon thingamy like every other background app does. Meaning this is still beta quality, really - but it does its business and doesn't eat all available CPU.
I'm hoping to integrate with various other applications/services. Trello, Slack, etc. That would be for workflow-ish functionality. Fred assigns something to Wilma in Trello by changing the 'assigned to' aspect of a card, and a few seconds later it appears on her C: drive. A spreadsheet say.
I've tested it with both Assembla's and RhodeCode's Subversion platforms. I've also tested it with a bunch of my own Subversion deployments. One - a $10 Pi Zero W with a $70 200GB SdCard in it. Another a EC2 deployment of Subversion/Apache2.