WowAce

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

A small checklist for raid (de)buffs and who brings what.

Shows your standings with the factions.

Manages tracking of raid attendance, loot, and more.

Tracks the precise arrival & departure schedules of boats and Zeppelins around Azeroth and displays them on the Mini-Map and ...

Uses linear regression and a log of hitpoint values to estimate how long a boss has left to die and reach execute range.

Shows activity for hidden ChatFrames by making their tabs flash.

Shows the health of the player's current bodyguard.

The One-Key-Mount™ — Simple to use, configured with Rock

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

Visual loot monitor

TrackingBar

oUF element for highlighting debuffs that are dispellable by the player

Manages tracking of raid attendance, loot, and more.

Shows the spec of people around you in the tooltip.

LatencyAlert

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

Alternate Rune Display

MendWatch

Calculates incoming damage avoidance and mitigation