WowAce

Assessment

Show buffs on nameplates.

Plugs classical world style fonts into LibSharedMedia-3.0

Calculates and shows your TankPoints in the PaperDall Frame.

Show vignette icons sooner

mount and companion manager

Adds custom effects to your cursor.

Kiwi Plates

Displays the locations of the chests for the Treasure, Treasure Everywhere achievement

Displays information about the current zone on the World Map, for WoW MoP Classic

Find five Ephemeral Crystals, get a pink hippogryph

A Friend-Enemy-Unit-Frame for battlegrounds.

Food/water macro generator

Allows the user to preview and track their progress in the collection of various transmogrification appearance sets

Add-on that shows which mounts can be farmed this week

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

Good old LibTourist-3.0 for WoW Classic Mists of Pandaria

Am I locked out? - Displays all RaidIDs for all chars

Collects Herbs, Mines, Gas Clouds and Fishing locations and adds them to the worldmap and minimap

Adirelle's unit frames, based on haste's oUF.