WowAce

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.

A UI for searching the guild roster.

Tracks the Blood Shield for Death Knights.

Compact rune and proc display for Death Knights.

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

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.