Steam now offers Wurm Unlimited for Windows, an updated Steam standalone release of Wurms Online, an MMOG co-developed by Minecraft creator Markus "Notch" Persson. Here's word:

What is Wurm Unlimited?
Wurm Unlimited is your full standalone version of the fantasy sandbox world Wurm Online, the MMORPG where the players are in charge!

A pioneer in the ideas of player influence, crafting and adventure, it is now one of the most deep and feature packed sandbox experiences available.
Whether you enjoy building your home, conquering kingdoms or hunting dragons, Wurm will let you.

Explore the world and make your mark!

In Wurm Unlimited, players can explore an elaborate fantasy sandbox world in the predefined Creative or Adventure modes as well as set up their own game server and invite friends to live and experience the Wurm universe.