WowAce

Customize the appearance of the chat bubbles.

Assist you with faction transfers letting you know which mounts, spells, etc you have and what they will be swapped to.

Fancy up the PlayerPowerBarAlt frame

KivinLootzor

Communicates with guild members for their positions on the world map

KivinSpamGuard

Makes those pesky garrison animations go away.

Control screenshot format and quality via LDB displays

Prospecting and Disenchanting Aide

Puts a timer in /yell when you get Unbound Plague during the Heroic Professor Putricide encounter

GirlFriend

Library to provide non-explicit cooldown tracking and callbacks.

Adds Raid Target Icon status to Grid (Player or Player Target).

Hotkey interface for spells, macros, other clickables.

Poppins

BigWigs_RazuviousAssistant

Adds 3 indicators to each side (top, bottom, left and right).

Flames anyone who lets his debuff expire on Malygos Phase 3

AbacusLib

Enables cooldown notification between players and allows party members access to each-others spell books.