Addons
Addons are helpful for several aspects of the game, from cosmetic changes to your UI to threat trackers and damage meters and scripts that extend the functionality of the client. Here, we have listed a few useful addons for you to download. There are hundreds of addons to find for World of Warcraft so if you can't find what you are looking for here, make sure to search the internet. Make sure the addon is coded for client 3.3.5a and not for Wotlk Classic.
Addons listed below are a few suggestions to help you get started. No links are provided at this time, but check back regularly for a more complete list with full download links.
UI Replacements
ElvUI
A very popular and modular replacement of the base UI with many extra features.
Pitbull
Very customizable unit frames for those who crave more control.
Bartender4
Replacing and extending the action bars with numerous design features.
Threat and Damage meters
Omen
Fast and accurate threat meter that can be skinned in ElvUI. Works with bots.
Skada
Modular damage meter that can be skinned in ElvUI. Works with bots.
Recount
Damage meter with basic threat tracking. Skinnable in ElvUI and works with bots.
Bot control
Multibot
Expandable action bar with lots of commands to summon and manage playerbots.
Quest Guides
Quest Helper
Quest pathing with built in objective tracker. Does not require TomTom for waypoint arrow.
Dugis Guide Viewer
Extensive levelling guide including dungeon tracking and maps. Requires TomTom for waypoint arrow.
WoW-Pro
Numerous detailed guides for fast levelling. No support for dungeons and requires TomTom.