WowAce

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

MaxStats

Libary for cleanly inspecting other players

CatPoints

Skip the gossip and select the normal NPC action

iTargetingFrames

Try to keep them thar pets wrangled

Simple, nice-looking power bar addon for all classes.

Tracks Black Market Auction House auctions.

Simple and rich Death Knight rune customizations

KivinLootzor

Toggle Windowed Mode with click or keybind.

Adds indicators to the sides of Grid frames.

ViewAddonMessage

Social tracking suite.

Modifies the inbox into a scrollable inbox, including open all options

ArenaHistory

Allows for gold tracking across multiple time frames

LDB display for Oak Interrupts Broker

Keeps track of people who have recently sent you messages.