WowAce

Allows you to view all items from all your characters on the same account, when-ever and where-ever you want.

Keeps track of current money and all your characters on one realm.

Toss those bugs inna sack.

Officially the original source for where things are in the Broken Isles, in HandyNotes

Auto repair + shows durability.

Makes the default frames moveable via simple drag and drop

Set and manage character notes that are displayed in unit tooltips and /who results.

Postal: Enhanced Mailbox support

Kiwi Plates

Save and send chat messages to many channels. Allows quick item and profession linking within your messages.

Provides access to all Portal and Teleport spells on right click of one button.

Adds unreal tournament style sounds to PvP encounters.

Entertaining kill-shot notification.

Redirect character errors, system messages and information messages.

Show the appearance of an item when you mouse over it

Grabs bugs for the bug sack.

EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.

Simple and Advanced combined - Bartender4 ActionBar AddOn

Display Cooldown Count of Spell Icon and Item

Point to quest POIs on your minimap