WowAce

Makes tracking reputation much simpler. By InSo(v)nIaX

Displays a reliable cooldown timer for the Shaman Ascendance ability

GearRating

SpellWatch

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

Embeddable library to track raid/party roster

Automatically invites player from templates.

Quickly builds /target macros for immediate use.

Adds pipes which can control arbitary other statuses (like toggle status on key or "in combat"-state).

HazLoot

Restores channels and channel-window associations after disconnects remove them.

Deformat

Whats

FuBar_NetStatsFu

Replacement for the default minimap.

Announces interrupts in the chat

JostleLib

Adds icons to the configuration menu for all standard Grid indicators.

A frame with a text that gives you the amount absorb left on target, or in TankMode absorbs left on yourself.

TGuildFrame