Epic game incoming:
Okay, its Wurm. Some of you might have heard of it, some have not.
Long story short, its like GMStranded with Runescape graphics. You build a house, increase carpentry skill when you nail the planks onto walls, you fish, you tame animals, you kill caverats, you dig a hole, you turn a beach into dirt, etc, etc. Very fun game if you like GMStranded, I have been stuck on it for a week.
It is pretty old, but just striked on wiremod.com and facepunch.
Goto wurmonline.com for more info. You need to register to download it, it IS free, but you can pay for premium, which removes the 20 skill limit, (though, takes a looong time getting 20 in something).