Wurm Online is described as 'Independent, ground breaking MMO that allows players to dig, flatten, raise and shape the land and create the frontier world they live in' and is a exploration game in the games category. There are more than 25 games similar to Wurm Online for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Wurm Online alternative is Minecraft. It's not free, so if you're looking for a free alternative, you could try Terasology or King Arthur's Gold. Other Wurm Online like games are Terraria, Creativerse: The Definitive Edition, Voxelands and Minecraft Earth.