Developer tool for tracking quests as you complete them... including the hidden behind the scenes tracking quests for objects/mobs. It also tracks details about the vignettes that you've seen in the current session.
I use it to work on my HandyNotes plugins, because the tracking quests are hard to work out otherwise.
This provides a DataBroker plugin to display the data.
If you don't have a broker viewer installed, type /questschanged to show the log.
You can also type /questschanged icon to toggle a minimap icon.