WowAce

Allows you to view all items from all your characters on the same account, when-ever and where-ever you want.

A powerful, comprehensive utilty for displaying graphics and information based on buffs, debuffs, and other triggers.

A friendly companion that remembers the chat.

A modular, lightweight and screen-estate saving grid of party/raid unit frames

Another HUD addon

Food/water macro generator

Chat addon, filtering messages and UI changes

Smooth combat HUD based on ArcHUD2

LibItemInfo-1.0

Officially the original source for where things are in the Broken Isles, in HandyNotes

Scan for rare mobs so you can find them and their loot

Bulk mail reception made really easy

Estimated range display. Type /rangedisplay for config

Bulk mail sending made really easy

Show what quests have changed

Automatically enables or disables combat logging based on location.

Loot management tool

Show the transmog appearance of an item when you mouse over it, and shows collection-status in bags, shops, and elsewhere. Works on transmog, mounts, pets, and decor.

Dog-themed unit frames. Woof. Arf. Yip.

EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.