Hexxagon

Two players attempt to control the majority of spaces on a customizable board by spreading, jumping and infecting. Spreading involves adding a new piece adjacent to an existing one. Jumping means moving a piece two spaces away. Whenever a piece is placed adjacent to opposing pieces these are infected, meaning replaced with friendly ones. Hexxagon is an adaptation of the game Ataxx for a hexagonal grid instead of a square grid board. Like Ataxx, it has only been published as computer software.

Online Play

 Gamerz (turn-based, play by email or play by web)
 Yucata (turn-based)
 Vying Games (turn-based, featuring 2 or 3 players, and random blocks)
 http://www.iggamecenter.com/ - igGameCenter (real-time, 2-3 players)
 SkillGamesBoard (cross-platform, real-time play, human opponents, bots, turn-based for registered users)