WowAce

Replacement of build-in loot frame

A seperate focus bar, with focus gain prediction and rotation forecast.

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

Automatically sells low quality gray items and selected white items to the vendor.

Debuff Monitor: A Powerful & Configurable Raiding Tool

Shows optimal target to use various area healing spells

Replacement for the default minimap.

Embeddable library to track raid/party roster

SurgeonGeneral Listen CLient

eePanels2

Fancy up the ExtraActionButton frame

ERP

Right-click on minimap blips to open a targeting menu (out of combat).

OneBag is a replacement for the default game bags that combines all the bags into one frame.

JostleLib

Show an in combat indicator

Facilitate better communication for loot councils

Welfare Epics

Crowd-control monitor

LFD status via a DataBroker display rather than the minimap.