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Obviously ATITD is a unique beast in many respects, but are there any other MMORPGs that force you to gather resources to build your house and all the tools and such in it? Besides WURM of course.
These may not be on the lists, but:
and http://www.cantr.net/ (this one is browser-based and text-based but judging from reviews, incredibly immersive).
Now playing: MUDs
Waiting on: Nothing
H&H was pretty fun when I tried it out, I will vouch for it too. Was a bit confusing, and I never did find the straw I needed to work with, but if it's still up and running I may try it out later. It's like if runescape did what ATitD and Wurm does (to an extent).
Writer / Musician / Game Designer
Now Playing: Skyrim, Wurm Online, Tropico 4
Waiting On: GW2, TSW, Archeage, The Rapture