WowAce

Should I send that recipe to my alt?

Angry Raid Points Client

Resizes some default UI frames (GuildUI, LootFrame, RaidInfo, TradeSkillUI and TrainerUI) to show more lines

Animated target indicator

Keeps track of space left in your bags.

Auto roll greed, need, pass or manually roll on items.

A library to get currencies' related information

MountUp

ItemSync the happy item gatherer and toolkit.

FuBar_FactionItemsFu

Tells you which blob to kill at the Yor'sahj encounter in Dragon Soul.

Gathers statistics on certain chance-on-use spells, also known as procs.

Heads Up Display with Player and Target Info

BuffMe

Tells you the Tiller, what food they like, and if you have fed them today for the quests A Dish for ...

Inventory and bank organizer.

Adds predicted lists for spells while the user types

Necronomicon2

Reorients the camera to be behind the character after a charge.

Quickly see what counter-combinations your epic followers cover and which ones are likely to get a new combination when rerol...