TERA is described as 'The first true action MMORPG, providing all of the depth of an MMO with the intensity and gratification of an action game. Players fully control their characters using the game's dynamic battle system' and is a MMORPG game in the games category. There are more than 25 games similar to TERA for a variety of platforms, including Windows, Mac, Linux, Android and Android Tablet apps. The best TERA alternative is Guild Wars. It's not free, so if you're looking for a free alternative, you could try The Lord of the Rings Online or Star Wars: The Old Republic. Other TERA like games are Stendhal, EverQuest, Spiral Knights and Betrayal at Krondor.