WowAce

Dropdown library for Ace3 options, extensible to other options formats. Works ok.

FuBar_RecZone

Keeps track of space left in your bags.

Shows your standings with the factions.

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

AVR Encounters

AnchorsAway

Heads-up minimap display

Gives detailed descriptions of particular localities, as zones or instances, and provides optional TomTom integration.

Test whether the player can really dispell a buff or debuff, given its talents.

Add-on that allows you to setup and quickly switch between different profiles of your action bars

RaidInfo

Transcendence Monitor for Monks

aUF_RangeCheck

Simple Spell Alert

Doublerightclick casting, autolure and sound enhancing

item2phpBB

HunterAEP

VersionChecker

Pins on the World Map for quests you have not completed yet