WowAce

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

Gives detailed descriptions of particular localities, as zones or instances, and provides optional TomTom integration.

What did you just loot?

A customizable view of friends and guildmates.

Complain about crowd control breaks.

xchar

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

FuBar_RecapFu

Adds your name to chat messages

QuestAnnouncer

LDB data source displaying rested XP for whole account

FuBar_PetInFu

ImprovedTargetFrame

Eliminates the spam from the chatframe and sums it up in a broker plugin.

Display the global cooldown around your cursor. (+ other stuff)

Needja Tracker

Assister

Automatically leaves the global channels when inside an instance/raid and restores them when exited.

quick quest turnin and acceptance with a shared keybind

A library to handle rearrangement of blizzard's frames when bars are added to the sides of the screen.