WowAce

This addon helps with daily quests.

A module that lets you find out what today's dailies are without having to visit the quest givers.

Helps you keep track of your experience.

Quest information

Checklist and notes addon.

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

Show optimal path for artifact leveling

Dailies Quest Tracker

A total number of quests Data Broker plugin.

Count and Track Daily Quests

Remaining and rested XP Data Broker plugin.

Provides training reminders to help decipher the Blizzard Spell Alerts.

FuBar_MonkeyQuestFu

Quickly builds /target macros for immediate use.

Alert your friends when you ding, get an achivement, or get phat lewts!

VendorSearch adds search features when buying items from any vendor

Selectively loots your fishing catches.

Never forget which one in that 5-mob pull casts what spell again.

An addon that automatically loots items for you.

RepWatch