Salem is described as 'fully open sandbox MMO with deep crafting elements. The game features permadeath as one of its main ingredients, along with an in-depth character development system without set roles, where the player can chose which kind of game to play' and is a exploration game in the games category. There are six games similar to Salem for a variety of platforms, including Windows, Linux, Steam, Mac and Android Tablet. The best alternative is Terraria. It's not free, so if you're looking for a free alternative, you could try Wurm Online or Ashen Empires. Other Salem like games are Haven & Hearth, Krafteers and Wild Terra Online.