WowAce

Shows the spec of people around you in the tooltip.

Monitors the combatlog identifying players from the oposite faction near you.

FuBar_TinyTipFu

Cryolysis 3

Filters unimportant Buffs.

BigWigs_HealbotAssist

BigWigs_RazuviousAssistant

User-configurable protection for your inventory. Automatically buys back mistakenly sold items.

iTargetingFrames

Keeps track of important de-/buffs in a splash screen

Status indicator that shows if a unit is hostile (probably mindcontrolled)

Try to keep them thar pets wrangled

Action button layout and configuration

Converts incoming ALL CAPS CHAT into lowercase text.

oUF element for highlighting debuffs that are dispellable by the player

Counts stacked lifeblooms and uses progressive colors to indicate the active number of HOTs.

A Coordinates Data Broker plugin.

FuBar_PitchFu

Adds a simple percentage threat status to Grid.

CleanShot