WowAce

Lightweight time/date display with optional hourly chime.

StitchUI

DaHud

Automatic Refilling of User Defined Items

BananaBar2

Adds a button to your character and inspect window that shows a summary of gear enchants and gems.

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

FuBar_VoiceFu

Toggle Windowed Mode with click or keybind.

Lag tolerance module for Broker displays.

Alternate Rune Display

Short EPEEN

Considers an item against all the items you have to determine whether or not it is an upgrade

Tracks skill and tradeskill costs and progressions, as well as trainer locations.

Shows the health of the player's current bodyguard.

Accelerates Camera Zooming

NameTagToggle

Display the global cooldown around your cursor. (+ other stuff)

WF3sec

Gives a score for your kit allowing easy comparison with others, also colour codes kit based on appropriateness for your level.