WowAce

Toggle Windowed Mode with click or keybind.

Scans your Equipment for cumulative item bonuses and sums them up.

HazLoot

Automatic tracking of the current target's creature type. For the discerning PvE hunter.

BankAccountant

FelwoodFarmer

Rep2 displays a message, which shows how much reputation you gained, and how much is needed until the next standing.

Uses guild notes to add alts' main names to chat windows and other places

Adds aura indicators to unit frames

Announces Mage Spells in chat.

Buff reminders and more

Adds 3 indicators to each side (top, bottom, left and right).

ChatHighlighter

Make it easy to explain bosses in Raids.

Makes the message dialog movable

MountUp

Library providing mouse-click support for LibQTip-1.0.

Track any items you want in a tooltip

Keeps track of healing spells cast by everyone in a group.

FuBar_AbramsFu