UO custom content question
I have a strange question, I was curious how does custom content work on UO shards exactly? I see that a lot of shards I've looked at throughout the years have had the same custom content like skill balls and other things like that, so I was curious if there was some set of UO "mods" somewhere that server admins look through when setting up a server or how it works exactly.
I didn't play much on the official shards since I'm just a tad out of the age range to have been around for the height of it but I played a lot of custom shards, some with really unique and strange content like Current Online World(COW) and Crow's Kingdom, and then also a number of shards that share the same pool of custom content.