WowAce

BigWigs_HealbotAssist

Shows the spec of people around you in the tooltip.

FuBar_PitchFu

Aggro notification library.

LDB data source displaying character stats

Adds an additional spell alert if you have more than one charge of a buff that is normally tracked by the in game spell alert...

TickTo

Database of your death locations for HandyNotes

Reputation Statistics - Gained, Needed, Rep/Hr, Session Time, etc.

Overlays Archaology digsite icons on the flightmap

Draws 3D portraits for main units that can be moved or resized at will.

Status indicator that shows if a unit is hostile (probably mindcontrolled)

Destruction Warlock priority module for clcInfo -- Maighurl

Browse your guild members crafts anywhere, anytime.

Displays an estimated time until you're out of mana

FuBar_FromAViewToAKillFu

Creates a broker plugin for all your broker launchers

HealGraph

Show who is targeted by at least one enemy, and the casting progress of the incoming spell.

PVPtimer