WowAce

Good old LibTourist-3.0 for WoW Classic Mists of Pandaria

Add-on that allows you to setup and quickly switch between different profiles of your action bars

Quest helping: fetching items to use, that sort of thing.

Cartographer_Routes

Show where the chests are for Withered Army Training

Collect data about you myth+ challenges

Tracks profession specific cooldowns and items across all your characters

Captures chatframe Tradeskill Links for later reference in an easy to read format

PoisonMenu

Makes those pesky garrison animations go away.

Outdated! Please use 'XLoot', available on Curse and WoWI

Waitlist addon with EPGP Mass Award hooking.

SwapMagic

Draws some lovely 3D portraits in the standard Blizzard artwork.

SimpleChatMods

FuBar_CraftTimersFu

Death reports

LDB data source for Combat Tracking

SmartyCat

Pins on the World Map for quests you have not completed yet