There are some useful addons in the game of World of Warcraft.
Auctioneer addon lets you track the auction history of any item that has been up for auction and use that information to identify items that are selling below their average value, buy the auction out, then put the item back up and make huge profits.
Item Rack addon makes swapping equipment for stance changes, special monster encounters and just general role-playing much easier. You simply add equipment slots to a bar and on the bar a mouse-over will create a menu of all items in your bags that can go in that slot. Just set up a hot key for that item rack and you're all set!
   Equip Compare addon makes the feature available everywhere in the game where you can hover over items like in your bags, in a loot windon, chat box, and even on the reward page of a quest. The feature is that when you shop for items at a vendor or the AH and you hover over an item, you get a comparison tooltip, which shows your currently equipped item so you can campare which one is best.
Gatherer is an addon for herbalists, miners and treasure Hunters. Tracking the closest plants, deposits and treasure locations right on your minimap with definable colors, icons and reporting distances is its main purpose. Gatherer doesn't track like a tracking ability; instead it remembers where you found various items in the past and alerts you on the minimap when you pass by those locations again.
X-Perl Unit Frames is an enhanced version of Perl Unit Frames that completely replaces the Wow default unit frames. This addon adds tons of useful information for you and your group's unit frames including a range finder to tell where someone is in relation to you, a monitor to track heals over time that you've cast and list debuffs you can dispel, 3D portraits for all characters, and many cool features especially designed for raids.
Scrolling Combat Text addon is a fairly simple but very configurable mod, adding damage, heals and events as scrolling text above your character - much like what already happens above your target. This makes it easier to concentrate on the battle without having to watch your regular combat chat window to see how much and what damage you're taking. Wow has a built-in scrolling combat text option but this addon takes what's good about that and adds a bunch of great features.
Natur Enemy Cast Bar addon displays who your target is focusing its attacks on and its full casting bar including a timer that lets you see exactly when a spell is going to be cast so you can time interrupts and counter-spells with exact precision. It also displays timers gains (like buffs or HoTs), cool-downs, DoTs and debuffs like stuns or polymorphs.
Atlas addon provides detailed maps for instances, BGs and other popular areas within World of Warcraft. These maps are high quality and the addon has a built-in in-game map browser that loads off your existing UI map. No more getting lost in instances
Tital Panel adds an entire suite of useful information and controls to bars that can be displayed on the top or bottom of your screen. This addon allows you to easily turn on and off modules like coordinate display, experience points earned per hour, group loot type, equipment condition and cumulative bonuses, honor points, sound, volume, and much more.
KLH Threat Meter is like a damage meter except that instead of showing the damage you're taking, it records the threat that you're generating. By monitoring all the abilities you use and checking your talents, armor set bonuses and buffs, this addon can recreate the threat list of a mob. This makes tank transitions simple and allows DPS classes to max their damage output without pulling aggro.

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