Can anyone suggest a programme or website that will allow playing diplomacy with all players on one computer. Ideally this should not involve logging in and out, or having a window open per player. I would like to use it purely as a movement judge, so once all orders are submitted on paper, then they can be copied onto the screen, and the "Go" button clicked to show the results (ideally with nice arrows showing where units bounced, convoyed etc.). I have found many programmes and websites that provide great interfaces for play-by-email or play-by-web for a single player, but nothing for helping with face-to-face games.
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The software I know of is Realpolitik.
I know that at games Dan Burgess has hosted in Chicago, they've used this program (eg see his comment here), but I believe not in lieu of ordinary analogue adjudication over a board. The general setup as I understand it is that a non-playing host loads the moves into Realpolitik and adjudicates, which is synced up to a computer screen in a different negotiation room(s), so that players in that room can see the current position of the board while negotiating. I've never actually see this in progress, if you want more information, I'd contact one of the Windy City Weasels.
Call me skeptical, but I'm not convinced of the advantage of using automatic adjudication (perhaps if I see it in action I'll become convinced, maybe cutting down on errors is one possibility, but not the one mentioned in comments). The orders still needed to be read, and the results assimilated by the players, so I don't see a major time saving (since assimilation usually occurs simultaneously with hand-held adjudication).
jDip is an exact fit for that. It is a free java program so can run on any platform.
The kind of software you are looking for exists.
MSN - Gaming Zone used to support Diplomacy, but something must have happened between Hasbro and Microsoft to change this.
Stewart Cross has an interesting article on the difficulty in creating the Diplomacy GM. If you are looking for reviews of the PC game, you might check GameSpot, or AllGame (although it looks like this site is a data farming site like Answers.com). I would normally use GameFAQs.com, or MobyGames.com, but both don't seem to have much useful information on them.