WowAce

LDB data source for Combat Tracking

Entertaining kill-shot notification.

Food/water macro generator

VitalWatch

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

Sheppard

Gathers statistics on certain chance-on-use spells, also known as procs.

pDebuffList

CCBreaker

Displays the time remaining before your (temporary) pet is dismissed.

Heads Up Display with Player and Target Info

KillingSpree

Calculates optimal reforging for given weights/caps.

Combat log evolved.

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

Estimated time until current target will die.

Allows you to create icons, which can be customized greatly by user's input. CiR is more than just the usual cooldown tracker.

DotDotDot

A FuBar plugin to show Recount.

Visual Raid Cooldown Tracking