WowAce

RapidCast

Acolyte2

Displays friend notes in unit tooltips, at logon, and in /who results.

TouristLib

Library handling communcation for Magic* addons

Mutt (Macro Update Target Tool) provides slash-commands that can patch the predefined targets in your macros.

Loot management tool

Adds the toon name to the alert that your RealID friend has come online.

Aura alarm.

Keeps track of resurrection spells cast in a group

Adds party/raid role icons in useful places

Tracks profession specific cooldowns and items across all your characters

aUF_RangeCheck

Check the quality of wild battle pets

VitalWatch

GoldenRun

ImprovedRWF

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

Tooltip scanning library.

StarVisuals displays various data visualizations