WowAce

Note + rep tracking for players, with guild data sharing.

Adds a button to the quest completion interface which allows you to auto equips selected quest Item after completion

Should I send that recipe to my alt?

Tells you the Tiller, what food they like, and if you have fed them today for the quests A Dish for ...

Shows your standings with the factions.

tracks and share quests between your party

Makes the message dialog movable

Powerleveling guide framework

GrindStatus

OneChoice tries to help you reduce quest reward choices down to, ideally, one choice.

View party member quest logs

Quest information

"Your quest log is full". How many quests do you have in your log?

Notifies you of experience gains

Quest helping: fetching items to use, that sort of thing.

QuestAnnouncer

This addon helps with daily quests.

Displays the zone level ranage of the zone you are in and also gives you a suggest zone and instances to be in.

Keeps track of time played and rested XP across your characters.

Checklist and notes addon.