WowAce

tracks and share quests between your party

Questing minion

Displays Instance Maps

All in one buffing mod for all classes. Paladin buff generated assignments based on Paladin capabilities and raid member sub-...

A fancy LDB reputation display, show faction reputation and reputation change history

Adds various information based on PeriodicTable to item tooltips.

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

MorgDKP

Displays online guild mates.

Gears skins for Masque.

Keeps track of your current location.

Collects Herbs, Mines, Gas Clouds and Fishing locations and adds them to the worldmap and minimap

Cryolysis 2

Keeps track of your top hits, heals, criticals, etc.

Tracks the HoTs you cast.

An extension to the default WoW Unit Frames.

Adds a status to Grid for debuffs applied by Raid Bosses.

XRS

Antagonist

Assessment