WowAce

Tracks the gain of experience and money.

Track any items you want in a tooltip

Welfare Epics

Sneakily inspect how much gold your mouseover target has made so far.

A Just for fun addon that converts money displays to show totals based off Harry Potter's currency system

Adds item values to chat messages.

GigaItemAuction

AuctionProfit saves information from your invoice auction house mails.

Keep you bags clean with easy loot filtering and removal.

Provides info about spell teaching items.

CrossRealm

View all your Auctions on any DataBroker display.

AHsearchNext

Simple Currency LDB Feed

Track friends / enemies in a convienent window, with optional logging

Tracks money/tokens across all your characters; /goldwatch for options.

GPriceEach

AHDND

Sends any gold exceeding a set cap to a specified toon when opening a mailbox

A gnome sized calculator.