WowAce

Allows the user to customize the the tooltip with lua-scripts

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

A simplistic clock.

DarkCandy

Toggles player names.

Angry Raid Points Client

Quickly assign the highest follower to each building or unassign all of them.

Numen

MendWatch

EQCompare

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

FuBar_ButtonSmashFu

Loot management tool

ItemValue

FuBar_ItemDBFu

FuBar_UIReloadFu

OneChoice tries to help you reduce quest reward choices down to, ideally, one choice.

Displays an alert whenever you loot an item for the first time.

Constructs a SimC export string for an item without equipping it

NameTagToggle