WowAce

KC_PlayerFramePlus

Shows a countdown bar for the duration of auras (e.g. HoTs, DoTs)

Automatic ammo reloading and selection, with warnings.

This addon helps us track Renewing Mist and Uplift for Mistweavers.

Shows where the equipment of inspected users or yourself is from.

A library to provide tools for formatting money and time.

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

Tells you which blob to kill at the Yor'sahj encounter in Dragon Soul.

Quickly builds /target macros for immediate use.

Drops the least valuable item in your bags to make space.

A data broker plugin showing your longest fight and your current fight time.

EyeCandy

Adds 3 indicators to each side (top, bottom, left and right).

WhiteboardNG

FuBar_SpeedFu

Gnomish math at its best!

Prompts for canceling of pet battles if no rare pet is found in the opposing team.

LFD status via a DataBroker display rather than the minimap.

Shows you which bosses you've killed next to the raid finder frame.

Adds your damage to Scrolling Combat Text