Lui lets you know who looted what at the time of looting.
Which are honestly, downright ridiculouse. Besides those who take offense from such addons won't gonna to link all the pieces they got after each right.
This is the first thread that came up when I searched. https://forums.elderscrollsonline.com/en/discussion/352773/addons-that-show-what-loot-other-players-got/
So, I'm glad you've yet to experience it, but there are quite a few people who dislike it.
Dear op: maybe put in your title some taste of what the discussion is about like "Mod for sharing drops?" Or something.