WowAce

Cartographer_Mining

Shared handling of media data (fonts, sounds, textures, ...) between addons.

Stores a browsable database of spells that mobs cast

FuBar_ChatAlertsFu

Pet Theory

Doodle

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)

Displays the zone level ranage of the zone you are in and also gives you a suggest zone and instances to be in.

Database of Vendor locations for HandyNotes

Disease Tracker for Death Knights.

Configuration library

Broken in Midnight. I recommend MidnightFocusInterrupt instead.

TGuildFrame

AVR Encounters

eeShards

Adds the toon name to the alert that your RealID friend has come online.

TomTom CrazyArrow pointing to the targeted group member

Gathers statistics on certain chance-on-use spells, also known as procs.

Suppresses chat messages from damage meters and provides single chat-link damage statistics in a popup.

Enchanting data for Ackis Recipe List.