WowAce

A simplistic clock.

Auto roll greed, need, pass or manually roll on items.

AceBuffGroups

The One-Key-Mount™ — Simple to use, configured with Rock

Building a Better Mailbox

HunterAEP

Configuration library

BeneCast 10

Tracks the precise arrival & departure schedules of boats and Zeppelins around Azeroth and displays them on the Mini-Map and ...

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

Gives detailed descriptions of particular localities, as zones or instances, and provides optional TomTom integration.

Simple right click casting.

Combat log evolved.

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

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

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

FuBar_SWStats2Fu

Tells you if you're buffed

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

JasonQuest