WowAce

Splut

A library that handles the basics of "window" style frames

TrapBar

FuBar_KTMFu

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

Displays information about the current zone on the World Map

PetBar

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

Adds a couple of graph displays to Skada.

Adds on-screen buttons for the farming tools and seeds.

Adds resurrection and soulstone status to Grid, using LibResComm-1.0.

Tracks your keystones

Rep2 displays a message, which shows how much reputation you gained, and how much is needed until the next standing.

PoisonMenu

Visual Raid Cooldown Tracking

Automatically leaves the global channels when inside an instance/raid and restores them when exited.

Disease Tracker for Death Knights.

NCHide

aX_RaidStatus

Provides access to all teleporting spells and items on right click of minimap button.