WOW Add-Ons

Here are few usefull adds-on and their website source.

http://wow.curse.com/downloads/addons/

Few of them commonly used are

DamageMeters :- DamageMeters monitors damage and healing done by and to yourself and other nearby players. It keeps a running total for each player and displays the information as a bars chart in a frame on the screen. It is perfect for real-time comparison of the various members of your party or raid. At any time the text results can be output as "says", to raid or party chat, or whispered to another player. Many console commands exist for customizing the meters: type /dmhelp for a listing.

http://wow.curse.com/downloads/details/567/

KLHThreatMeter :- KLHThreatMeter is like a damage meter, except it records your threat. By monitoring all the abilities you use and checking your talents, armour set bonuses and buffs, the addon can recreate the threat list of a mob. This makes tank transitions simple, and allows DPS to maximise their damage without pulling aggro.

http://wow.curse.com/downloads/details/4204/

Few others commonly used are :-

Atlasloot Enhanced (Map)
Atlas (Map)
Natur EnemyCastBar (Combat)
X-Perl UnitFrames (Unit Frames)
Titan Panel (Action Bars)
ScrollingCombatText (Combat)
Deadly Boss Mods (Raids & Encounters)
Auctioneer (Auction & Economy)
SW Stats (Raids & Encounters)

All these are avialble at http://wow.curse.com/