WowAce

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

Wowhead Data dump for GatherMate

PvE Status Frames

Kiwi Plates

Keeps track of space left in your bags.

Aura alarm.

YssGuildShop

Smart mount randomization on a button! Empty coconut halves not included.

Tracks the current Fear Ward's in the raid or party.

Provides quick access to information on your group and their equipment, enchant and gem choices.

SpyGnome

Shows skills in a tooltip and allows them to be used.

Teleporters in Suramar? Sure, why not?

LDB display of currencies, gold totals and session / daily / weekly statistics for all characters on a server.

Keeps track of current money and all your characters on one realm.

A library to provide a clean dropdown menu interface.

eeShards

Shows where the equipment of inspected users or yourself is from.

Keeps track of performance of memory, latency, and framerate.

StitchUI