Hi, I recently played Diplomacy again for the first time in ~25 years and had a great time. It's a little tough to play face-to-face, though, you need 7 people and several hours. But it can be played asynchronously via email, or even through Facebook and it's great fun and need not take loads of time.
Looking about to see if there are Esperanto players, I found several links to
Jon Stewart-Taylor's page , which looks nice but it hasn't been updated since 1998.