There are a few required add-ons, nothing major, but they definitely help in raids.
Please note, the first three links are quite literally download links. If you click them, it will start the download of the .zip folder. The last one, there's an extra click involved, but what the hey, right? For assistance in installing add-ons, either ask a more experienced guildie or visit
lmgtfy.com.
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Omen3--
Omen3 is a light-weight threat tracker. If you aren't the tank, you should not be the first name on the list.
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DBM--
Deadly Boss Mods is a suite of independently loaded modules which tell you when to gtfo the stuff on the floor, stun the boss, and an assortment of other raid-saving info. Also helps with blocking whispers until you're done with the fight.
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EPGP--
EPGP is the guild's DKP system. If you want loot....you better get this bad boy.
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GEM--
Guild Event Manager...pretty self explanatory. You wanna raid? Better pick this little beauty up. She's kind of a fat lady, though, so be careful. She may eat all of your FPS.