WowAce

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

The One-Key-Mount™ — Simple to use, configured with Rock

LDB data source for herb, ore and skinning node data

Don't underestimate your little critters!

FuBar_BongosFu

Fires events whenever a raid member "fails".

Powerleveling guide framework

VitalWatch

Heal and decurse by clicking on customizable raid/party unit frames

Restores channels and channel-window associations after disconnects remove them.

Provide plenty of links

GridLayoutPlus

Automatic tracking of the current target's creature type. For the discerning PvE hunter.

Manager for DKP points. Requires DKP - Bidder as main Graphic User Interface.

Tracks the precise arrival & departure schedules of boats and Zeppelins around Azeroth and displays them on the Mini-Map and ...

A library to track nameplates.

On login, displays changes to your guild since the last time you logged in.

A boss encounter engine used by other add-ons

SurgeonGeneral Listen CLient

Shows the spec of people around you in the tooltip.