WowAce

Show a texture on demand

Automatic tracking of the current target's creature type. For the discerning PvE hunter.

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

Draws some lovely 3D portraits in the standard Blizzard artwork.

TrackingBar

Helps you decide which ability to use next according to priority you set

FuBar_ItemListFu

Handles the assignment, coordination, and announcement of many parts of the Lich King encounter in Icecrown Citadel.

Adds Buff/Debuff icons to the grid frame.

Adds Friend and Guild options to the context menu of player units.

Smooth combat HUD based on ArcHUD2

FelwoodFarmer

FuBar_ExperienceFu

Provide plenty of links

Assistace for Blackhand (Mortar warning in P2, custom says for bombs and marks in P3)

DeclineDuel

A Library for stat conversion, calculation and summarization.

Forces LSM and LibSink to use specific textures and sinks.

Teknicolor_tab

Adds Raid Target Icon status to Grid (Player or Player Target).