Because of many problems about not having most important addons in raids. i've decided to make this topic few weeks ago, but look i'm writing it now.
So here's addons you must have:
Deadly Boss Mods (DBM)
Omen Threat Meter
Also you could have:
Recount
Atlas
AtlasLoot
To manage my addons more easily I use program Curse Client what I recommend to all of you.
Deadly Boss Mods (DBM)
Features
* Boss mods for all raid bosses
* Colored raid warnings (players will be colored according to their class) with icons - so you will know what's going on without even reading the message
* Auto-respond during boss fights. DBM will inform anyone who whispers you during a boss fight that you are busy. These messages contain the name and health of the boss as well as the raid's status
* HealthFrame: you can enable a simple frame that shows a health bar for all active bosses. This is enabled by default for multi-mob bosses like Four Horsemen
And much more..
Omen Threat Meter
About:
Basically, enemies in WoW decide who to attack by deciding who is the most threatening based on the abilities you use. What Omen does is provide accurate values of your group's relative threat level on individual enemies, so that you can see when you're in danger of pulling aggro (or, if you're next on the snack list if your tank bites it). This info is usually only critical in raids, where only tanks can survive aggro, but it's useful for any multi-player situation.
Recount
Recount is simple damage meter with ability to view realtime graph.
Atlas
Simple addon which shows maps of all instances. Also traveling locations and more.
AtlasLoot
AtlasLoot Enhanced is an UI mod allowing for loot tables of bosses to be browsed whenever needed within the game. It can access full item tooltips, show drop rates, allow items to be chat linked and to use the dressing room.
Programs:
Curse Client
Features:
* Download, install or update any supported games’ Addons with one click
* Easily track when your Addons need to be updated
* Keep your Addons in sync across multiple computers
* Never lose your Addon settings with Addon Settings Backup