WowAce

A Mount and Companion manager

Bind spells, items, and macros to keys, without using action buttons

Search, filter and craft gems in the game!

Inventory and bank organizer.

Adds achievement reminders to BigWigs

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

Does stuff for sachmo

Automatic Refilling of User Defined Items

Enables user defined sounds for Party, Guild, Raid and Custom Channel chat messages.

Separate indicator for your HoTs with timer.

Adds manabars to the sides of Grid frames.

Save and load macros.

Adds Outfitter set filters to AdiBags.

RaidSpy

Objective Tracker

Better quest log and tracker

Automagical macros for each talent tier.

Keeps track of time played and rested XP across your characters.

Tracks profession specific cooldowns and items across all your characters

SurgeonGeneral