The computer game I've been working on for the past 2 years has just been released. It's called Castle Vox and I encourage you to check it out.
The gameplay is a simultaneous-turn-based strategy model. So you don't have to wait for all the other players to take their turns, you're always taking your turn (except in-between rounds when the battle resolutions happen).
Here's a screenshot of the Napoleonic Wars map:
The full version has 35 maps and counting. The game includes a map editor so you can make your own, or edit the existing ones.