Palmpilot Calendar Sharing Solution?

Anonymous Coward asks: "We've been looking for a solution for sharing calendar data from our Palmpilots with other users on the local net. We'd prefer not to use Outlook/Exchange (or other expen$ive groupware) or a Web-based service. Is there an app, preferably open source, that perhaps has a Unix based server with Windows client software to sync the Palms?" Anyone have any clues? This is not the first time something like this has come through here. It would be interesting to know how far any Open Sourced calendaring solutions have progressed and if they offer any Palm compatibility.