Yep, it's a standard component of a couple Wykkyd addons, and will show all teammate's purple and gold quality drops. It includes their undaunted chest drops too.
Battle not with monsters, lest ye become a monster, and if you gaze into the abyss, the abyss gazes also into you. ~Friedrich Nietzsche
It's a feature that's incorporated into a number of addons. If you want a standalone addon that does just that, there is one available here: http://www.esoui.com/downloads/info1455.html