Legacy of the Dragonborn for Skyrim is foundational to most of my builds, it gives you a museum and plays on one of the best parts of any RPG: finding unique items. It displays your shit and makes money off it, and adds some more unique stuff to find like coins, statues and of course equipment.

I miss the Masterwork mod pack for Dwarf Fortress. It added a bunch of stuff, playable races, and enemy factions. I still think about the playable orcs from time to time. The guy who organized the pack seems to not be active in the community anymore after he used free but unattributed sprites in his tileset, and this maybe costed him his collaboration on the official tileset for the Steam release.