WowAce

Shows at-a-glance what raid buffs/debuffs you have.

A helper addon for the achievements "Let It Snow", "Fistful of Love", "Shake Your Bunny-Maker", "Check Your Head", and "Turkey Lurkey"

Interface-central mount management

agUF style oUF layout

Collects and displays census information. This AddOn is licenced under the GNU GPL, see GPL.txt for details.

A noble spirit embiggens the smallest player arrow.

A simple, zero config, trash item seller

Shows guild and system message of the day only if either one of them has changed since the last login.

Add-on that shows which battle pets can be farmed this week

Bars showing amount of buffstacks

MAcon

Aggro Warning System for Parties and Raids.

FuBar_TinyPadFu

Paparazzi

Replacement for the default minimap.

FuBar_TinyTipFu

Customize the PlayerPowerBarAlt display

Swap a random tabard every time you visit the bank if you are wearing one

LDB data source displaying character stats

Assist you with faction transfers letting you know which mounts, spells, etc you have and what they will be swapped to.