These programs you mention have a dedicated network server(s) (and charge for it by software purchase I think). You can host your own server on your own PC depending on your ISP and requiring a constant IP address and special server software, but this isn't straight forward and it could be hacked if you aren't very careful since you need to open a firewall port. You can rent space on a server, but this will cost you something. I don't think you will get a free network server run by someone else where you can run a server program for free. Flash (client side rendering) doesn't address the server problem I don't think, but it may be possible with Flash and server side software depending on web hoster, but good luck anyway.
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