WowAce

A Latency Data Broker plugin.

A simple addon that warns you if your pet isn't attacking while you're in combat.

Tooltip scanning library.

FuBar_GrindFu

See all incoming casts on your target. Also includes resurrection monitor. Uses libhealcomm-3.0 and librescomm-1.0

User-configurable protection for your inventory. Automatically buys back mistakenly sold items.

Automatically and immediately cancels all in-game cinematics and movies

Automatically switches Profiles of addons when changing spec

Simple, nice-looking power bar addon for all classes.

Notifies you when you get aggro.

RaidMarshal

Adds support for LibFilter to Baggins

Automatically equip 'Chef's Hat' if the Chef enters the kitchen (Cooking TradeSkill).

Adds aggro coloring to oUF.

Bits

Automatically converts a party to a raid when you attempt to zone into a raid zone without a raid.

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

Counts stacked lifeblooms and uses progressive colors to indicate the active number of HOTs.

Library for tracking mouse gestures

Colors friends/bg score board/who list names by class color