WowAce

Heads Up Display with Player and Target Info

Building a Better Mailbox

LDB data source displaying rested XP for whole account

FuBar_KillMeterFu

SupplyAndDemand

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

Loudmouth

Mutt (Macro Update Target Tool) provides slash-commands that can patch the predefined targets in your macros.

FuBar_RegenFu

SliceWatcher

Combat log evolved.

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

Give logical progression of Mining, Herbalism & Skinning. Will not be updated with WoD zones

TableTopLib

Reorients the camera to be behind the character after a charge.

A customizable view of friends and guildmates.

tekKonfig

A library to return spell duration and debuff type of a spellID.

Numen

Tracks profession specific cooldowns and items across all your characters