WowAce

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

Static library of wow map data

A replacement tradeskill window

Provides access to all Portal and Teleport spells on right click of one button.

Aloft

Good old LibTourist-3.0 for WoW Classic Mists of Pandaria

Entertaining kill-shot notification.

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

The core module for RW

Provides one or many informational windows with optional interactive widgets.

Quest History tracker and shows lists of quests in each category

Marks the locations of Hallow's End candy buckets on the worldmap and minimap.

Automated smart raid marking to speed up trash clearing in instance runs

Calculates and shows your TankPoints in the PaperDall Frame.

Achievements

Adds a status to Grid for debuffs applied by Raid Bosses.

Tracks the Blood Shield for Death Knights.

Smooth combat HUD based on ArcHUD2

Track time played, rested XP and money for all characters

Adds mob patrol paths to your map.