WowAce

lern2count adds ABinfo castcounts to spell and actions. It has a builtin reagentcount too.

Hides MicroButton Alerts

Alternate Rune Display

A volume control for Data Broker.

Doublerightclick casting, autolure and sound enhancing

A FuBar plugin to show Recount.

Generate a macro with random mounts

Track of your tradeskills across characters, create small buttons for them and track cooldowns.

Simplifies GDKP bidding processes

GonffBar

Reno is a slash-command that can patch predefined options in a macro to change which abilities will be chosen.

Loot management tool

Tracks whispers and conversations

Automatically and immediately cancels all in-game cinematics and movies

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

Various libraries based on LCD4Linux, offering users lower-level UI customizations.

Adds party/raid role icons in useful places

RoleCall allows you to easily see the talent specs and roles of everyone in your group.

Makes the Blizzard options frame movable and resizable

Timerbar embeddable library