🕶️ Its user interface showing an example of a strategy game (The Battle of Gettysburg (2nd Edition)) based on a map (that of the United States, in July 1863, during the American Civil War, with the victory of the Unionists over the Confederates) with its map in the centre of the screen with its different units in 4 colours (blue, grey, brown, green) representing the forces present, and its command buttons at the top of the screen - as if the whole thing were on a real gaming table.
📚️ VASSAL Engine is a libre, multi-platform, virtual table and game engine, for strategy games (including card games). It has a library of thousands of high-quality games (called "modules", free or commercial). It allows designing of games, the multiplayer game (exclusively) in real time (in hotseat / online) or by email and the passage from one to another, the drag & drop, the limitation of informations (hiding of pieces, of maps, ...), automated reports, ...