WowAce

Babble-2.2

Keeps track of your current location.

Broken in Midnight. I recommend MidnightFocusInterrupt instead.

StatLogicLib

Try on different gear and see their total stats and their differences. In short, an ingame CT-Profiles-like addon.

an embeddable library providing an abstraction layer for tracking and querying Blizzard's Nameplate frames with ease and effi...

Checks your gear before bosses and yells at you if you're an idiot

Manages social information with a focus on main-alt associations.

Visualises healing.

Display front-end for LibGuildPositions-1.0 using HandyNotes

Questing minion

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

Shows ZoneInfo on the World Map in a perfectly cromulent fashion.

SacredBuff

Open all your mail

Displays the locations of Garrison music scrolls.

Death analysis tool

Database of Diminishing return categories and general data

Keeps track of your top hits, heals, criticals, etc.

Displays Instance Maps