WowAce

XP and Reputation bars

Fires events whenever a raid member "fails".

Provides more visible access to dungeon and raid difficulty settings via FuBar.

Library for tracking cooldowns of other players

xchar

Debuff Monitor: A Powerful & Configurable Raiding Tool

Provides the ability to suppress specific spellcasts like "Deaden" from your casting bars.

AutoFIR

Cartographer_ExtractGas

FuBar_ChatAlertsFu

Database of FlightMaster locations for HandyNotes

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)

Mapster's Minimap brother

Combine

Angry Raid Points Client

Damnation

SysMon plugin for any DataBroker display.

Provides access to all teleporting spells and items on right click of minimap button.

Shows activity for hidden ChatFrames by making their tabs flash.

Customizing your buff display