WowAce

Evaluates your gear

FuBar_CraftTimersFu

Splut

Automatically sells low quality gray items and selected white items to the vendor.

Creates a broker plugin for all your broker launchers

Gives equipped and overall iLvl to indicate the quality of a character's gear.

Tells you who bought your auctions.

Allows frames to be dragged around, without permanently changing their position.

KC_Mobility

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)

Display and change minimap tracking modes from your FuBar.

Posts a BigBrother-QuickCheck to the raid-channel when a readycheck is started

Provides the ability to suppress specific spellcasts like "Deaden" from your casting bars.

Keeps track of gold and cash flow across multiple characters

Adds achievement reminders to BigWigs

Tells you which blob to kill at the Yor'sahj encounter in Dragon Soul.

FuBar_DPS

Library providing mappings between trade skill recipes, spells and created items

Open those clams (and other containers)

Provides information about the player's bodyguard.