WowAce

Provides information about the player's bodyguard.

Keeps track of healing spells cast by everyone in a group.

Note + rep tracking for players, with guild data sharing.

iTargetingFrames

Displays the time until the next battle and more.

Poppins

Show a texture on demand

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

Create reagents easily

Utilities for pixel perfection, decimal to hex, parsing item strings

Displays a variety of useful stats for tanking

Displays a reliable cooldown timer for the Shaman Ascendance ability

A Data Broker plugin to show AddOn memory usage.

Libra

Complain about crowd control breaks.

Spyglass

Tankalyze

RicoMiniMap

A simple range indicator for optimizing Halo damage.

Tracks whispers and conversations