This loot notification addon adds the loot group members pick up in the bottom right corner where you own loot gets displayed too.
If you don't know a set item yet in your collections, it will be displayed in red. Same goes for recipies and blueprints on the current character
Within the options menu you can set which quality is the minimum you want to be notified about as well as the color for the highlight and the text format used.
Dependencies:
In the future I want the addon to evalute items on their relevancy so you won't see irrelevant items.