WowAce

Displays a table for possible outcomes of incoming hits with their probability

GlyphRecolor

A standalone version of Angry Assignments to create and display personal notes on your screen.

Shift-clicking on a user name in chat shows a tooltip with their whois information.

Send Messages encoded with the hexadecimal system

A library to get localized boss names from the Encounter Journal

With Mists of Pandaria Blizzard publish all characters from an account unless you disable that 'feature'. This addon warns you.

Echos quest objective completion to your party

Adds TargetIcon status to Grid2 (player / player-target).

oUF_HolySmurf

Filters unimportant Buffs.

Tacticial pet battle information so you can be a Pokemon master

StatFrameLib

Locks the chat window tabs to prevent accidental undocking via mouse drag

Changes the quest log back to how it was before Patch 6.0.

Adds the "pixel perfect" font "Visitor" to LibSharedMedia

Provides accurate, millisecond-level timing.

Minimal KoS-list-addon

Adds filtering based on your known professions.

LDB data source for Instance Tracking