So I have seen a lot of requests on here and other places for an addon that would display any unfinished quests. I know how frustrating it is to be stuck at 61/62 quest in Shadowfen or someplace else. I fully support the request for such addon, but in the mean time, I was thinking if someone could make an alternative for now.
Idea : Put a marker on the map of all the quests (finished/unfinished). Since I don't think there is a way to check if you have done it or not (like the skyshard/lorebook addons) just put all the markers on and then people can travel from one to another and mark it complete manually. This would at least enable them to see which ones to do. Now the locations of the quests would be collected by users them self. I believe esohead has such addon that people can upload data that is then reflected in their addon. Meaning yes, it would take some time to get the community to contribute the locations of the quests, but I think it would be a great alternative since we have no other way of tracking quests.