Okies apart from the official game and its two expansions I could not live without:

Giants
Wilderness Mod
Morrowind Addidtions
Supper Adventurers
Better Heads

Those I consider the essential bare minimum. The new NPC graphics, a bunch of new critters and some balancing.

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I will call you "Squishy", and you will be my squishy! OW! BAD SQUISHY! - Dory, Finding Nemo