WowAce

HiveMind

Heads-up minimap display

Track any items you want in a tooltip

MainAssist

Automates bites during the Blood-Queen Lana'thel encounter in Icecrown Citadel

lern2count adds ABinfo castcounts to spell and actions. It has a builtin reagentcount too.

Adds your name to chat messages

Searches bags/banks of all your characters/guilds.

Fires events whenever a raid member "fails".

Shows the health of the player's current bodyguard.

FuBar_PTReagentFu

Displays online friends.

Cartographer_QuestObjectives

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

Shows skills in a tooltip and allows them to be used.

Watch tooltip updates to announce when you find specific objects

Inventory and bank organizer.

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

This will keep track of how much you have paid per item in your inventory. Only one of (Auctionator, Auctioneer, AuctionLite,...

TabletLib