WowAce

Shows skills in a tooltip and allows them to be used.

Manufac

Open all your mail

Litmus

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

Show what quests have changed

Add item levels to Inventorian

KillingSpree

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

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

Shows simple Buttons for your Cooldowns :)

Priority 3 loot announce addon

Adds your name to chat messages

manipulate the minimap in numerous ways; move, scale, skin.

Adds a highlight border to items in your MogIt Wishlist, making them easier to see.

MorgDKP

Simple right click casting.

Broker plugin to display player orientation

Sorts the Wardrobe

KoS-Management Tool