WowAce

Set and manage character notes that are displayed in unit tooltips and /who results.

Automatically enables or disables combat logging based on location.

Automatically leaves the global channels when inside an instance/raid and restores them when exited.

Manages social information with a focus on main-alt associations.

Compact rune and proc display for Death Knights.

Tracks the Blood Shield for Death Knights.

A UI for searching the guild roster.

Displays friend notes in unit tooltips, at logon, and in /who results.

Highly-configurable shield / absorb tracker.

Prints the cooldown/GCD on the last spell cast to chat.

Shared handling of alternate identity data between addons.

Disease Tracker for Death Knights.

Reports the total threat on a mob at the end of combat.