WowAce

MorgDKP

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

Keeps track of your current location.

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

Displays Pet Info for Hunters and Warlocks. Also keeps track of Stables and Pet and Demon skills.

Reports in raid chat whenever a raid member "fails." /EnsidiaFails to configure.

PvE Status Frames

tracks and share quests between your party

Alternate Power- and Combopoint/SoulShard/HolyPower-bar

Smart raid loot and DKP tracker with automated standby and learning

Co-ordinated targetless Party and Raid wipe recovery. Evolved

Cleans up minimap buttons and makes them accessible through a pop out menu!

StatLogicLib

Good old LibTourist-3.0 for WoW Classic Mists of Pandaria

Fires events whenever a raid member "fails."

UnitActionBars

FuBar_TrainerFu

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

PT3Browser

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