WowAce

Shows a circle on the minimap to indicate spell range

FuBar_FarmerFu

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

oUF element for highlighting debuffs that are dispellable by the player

Doodle

Monitors the combatlog identifying players from the oposite faction near you.

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

PT3Bar

Insanity resource tracker for shadow priests.

lern2count adds ABinfo castcounts to spell and actions. It has a builtin reagentcount too.

FuBar_TinyPadFu

MAcon

RangeRecolor

Timerbar embeddable library

Track any items you want in a tooltip

Allows for easy congratulating when someone earns an achievement.

FuBar_PoisonReminderFu

Visual loot monitor

Announces Mage Spells in chat.

opens/closes all bags when at merchant (instead of only the backpack)