Games where the map is divided into hexagons — hexes. This is convenient for strategy and tactics: each cell has six neighbors, distances are calculated more fairly, and movement across the map feels more natural. Many turn-based strategy and wargames, from Civilization V to Battle for Wesnoth, are built on hexes.
You can download games with a hexagonal map via torrent: the filters above will help you choose by language, size, and build type.