WowAce

Helps you automate selling stuff

Standalone of FuXPFu - Now sticks to anything!

Adds party/raid role icons in useful places

Keeps track of space left in your bags.

ClosetGnome_Switcher

Database of FlightMaster locations for HandyNotes

Display Garrison missons for all Characters

Automatically leaves the global channels when inside an instance/raid and restores them when exited.

A collection of Rogue modules.

KillingSpree

Easily mail friends, guild members, alts and others

Some handy events that should exist in the default UI

LDB data source for currency flow

Animated target indicator

Necronomicon2

Tracks the current Fear Ward's in the raid or party.

New/Old BG indicator, Join by ID, Quick Leave Queue, etc.

Enhancer

A simple slash-command-based addon for querying item information from the Blizzard servers via ItemIDs and SpellIDs.

Incubator