WowAce

Add-on that shows in a unit tooltip window a number of killed mobs of the same kind

A data broker display, that shows one block per plugin.

Tracks skill and tradeskill costs and progressions, as well as trainer locations.

Keeps track of time played and rested XP across your characters.

Better quest log and tracker

First Aid data for Ackis Recipe List.

Aspect checker addon for Hunters.

A full package of auras for all 3 Shaman specializations

Keeps track of resurrection spells cast in a group

NBuffBars

Search, filter and craft gems in the game!

Friends & Guild Data Broker plugin.

Loudmouth

Give logical progression of Mining, Herbalism & Skinning. Will not be updated with WoD zones

Adds manabars to the sides of Grid frames.

Automatic Refilling of User Defined Items

Tracking and ranking of dps/hps in a guild.

Keeps track of your reagents for buffing.

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

Set the clicking action for Grid buttons