turn-based

The Battle for Wesnoth is an open source, turn-based strategy game with a high fantasy theme. It features both singleplayer and online/hotseat multiplayer combat.

An online pokemon battle versus game

Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization.

Brutal Chess features full 3D graphics, an advanced particle engine, and several different levels of intelligent AI, inspired by the once popular »Battle Chess« released by Interplay circa 1988.

Hedgewars is a turn-based strategy, artillery, action and comedy game, featuring the antics of pink hedgehogs with attitude as they battle from the depths of hell to the depths of space.