WowAce

UnitActionBars2

This addon helps with daily quests.

Out of Mana bar.

Adds 3 indicators to each side (top, bottom, left and right).

Shows more recipies in the profession window.

Shows the duration of the most recent (or current) combat

EasyPet

Menagerie

ViewAddonMessage

A simple Fubar plugin for Cartographer_Routes to quickly show/hide routes in the current zone

Adds pipes which can control arbitary other statuses (like toggle status on key or "in combat"-state).

Clock plugin for any DataBroker display.

Grid module to emphasize units based on some configured conditions.

Bag and item management utilities

Advanced Chat Filtering and Spam Blocking Addon

Skills plugin for any DataBroker display.

Sets you to DND when you fight a boss, and some other crap.

Keeps an eye on someone's distance from you, and alerts you if they get too far.

Mutes Annoying Sounds

Intended to be a complete guild management tool suite)