Boss Encounters

BigWigs funkydude, Ammo, Rabbit, Maat

Boss alert mod. It consists of many individual "boss modules", mini addons that are designed to trigger alert messages and timer bars for one specific raid boss each. Modules are activated when you target or mouseover a Boss, or if any other BigWigs use in your raid does. In most cases only one module will be running at any given time.
Curse, WoWInterface

DBM Tandanu, Arta88, mysticalos, Mave99

Boss mods for all raid bosses, Colored raid warnings! Bars can be enlarged when they are about to expire, Some boss mods have very advanced features like the Loatheb healer monitor which allows you to setup a heal rotation and see the cooldowns of all healers, Synchronization system for accurate timers, No dependencies, no embedded libraries, 100% stand-alone, Modular design - all boss mods are plugins and can be exchanged, removed or updated separately, Load on demand - boss mods and the GUI are separate AddOns and they will be loaded when they are needed, e.g. the GUI uses no memory if you don't open it, Efficient code: low memory and CPU usage, Special effects like the screen flash and the screen shake effect to draw your attention on critical events - for example DBM will warn you when Thaddius changes your polarity, Bars can change their color over time and flash before they expire, Many bar designs to choose from, all designes are are customizable: you can change the color, size, icon position etc. Option to create custom timers, so-called "Pizza Timers" for your pizza or whatever you prefer to eat while raiding, Powerful object-oriented API - you can use it to write your own boss mods!
Curse

Dungeon Journal

EJ Smaller Map Buttons Dridzt

Simple addon to allow setting a smaller scale for the Encounter Journal Boss Icons on the World or Instance Maps.
WoWInterface

Raid Assist Mods

CTRA

CT_RaidAssist is your all-around raid mod. It can report hp, mana, buffs, and debuffs of anyone or everyone in your raid. You can set it to notify when someone is debuffed with specified types as well as notify when buffs you can recast fade. It can show 'MT Targets' which allow you to specify MainTanks's which all users in raid can then see. When shown, it will show you the target of the person set as MT. It's a bit similar to the Target's Target function though with this, the tank doesn't even have to be your target.
CTMod

oRA3 Ammo, Rabbit

oRA3 is the next oRA. It is not compatible with oRA2. It features the following: Durability, Resistance, Zone, Version Checks. Cooldown monitor for just about every spell with a longer cooldown. Invites based on guild rank, zone, keyword, and guild only keyword. Blizzard Maintank based maintank lists with custom sorting. Promoting to raid assistant based on guild rank, a list of names or just everyone. Intelligent readycheck window that will display a divider bar between groups 2 and 3 or 5 and 6 based on raid target settings. Loot settings based on party or raid. Works in party for readychecks, checks and cooldowns. You can find oRA3 as a sliding panel attached to the Raid overview.
Curse
Plugins: SimpleTankFrames, Broker_oRA3

Raid Frames

Blizzard Raid Frames - Indicators szandos

Configurable indicators for Blizzard Raid Frames showing time of buffs/debuffs on all units in the raid. There are 9 indicators for each raid member, one on each corner, one on each side and one in the middle. Indicators can be configured to show any buffs/debuffs of your choice and you can configure several buffs/debuffs in the same indicator. Some simple options lets you select to show only if the buff is missing, only cast by you, stack sizes and more. As an added bonus there's also an option to turn off the standard buff/debuff icons.
Curse

HideRaidFrame Ketho

Hides Blizzard's raid frames.
Curse

PerfectRaid Cladhaire

PerfectRaid is a whole new look on raid frames, giving you as much information as possible in an easily recognizable format that's easy to place. Show as much or as little as you're interested in, and completely customize using the each options editor.
Config: /praid
WoWInterface

RaidFrameResizer 10leej

Increases the range of the slider for the Height and Width of the Default Raid Frames so you can make the default raid frames larger, or smaller (which also makes it a nearly useful addon for the default UI).
WoWInterface, Curse

Misc Raid/Instance Mods

Am I Locked Out Starfox, stencil

Rembers which of your chars are saved to which instance/raid. Updates on login and every time you get the 'You are now saved to this instance'-message, a shift-click on the tooltip forces a manual update. So you don't have to log onto your chars to see if you can join that raid with one of your alts.
Curse

Doodlepad Humbedooh, Dridzt, Nevcairiel, Squeeg

A whiteboard addon for drawing doodles on your screen for use with explaining fight strategies, making commentary about videos or just doodling. Doodles can be shared across a party, raid or guild scope in real-time.
Curse

GTFO Zensunim

This addon provides an audible alert when you're standing in something you're not supposed to be standing in. In some cases, you'll be warned before you start taking damage. It's particularly useful for individuals that play with their spell graphics turned down or for those that just need a little extra help being told to GTFO. It also helps out with PvP when you can't tell who's casting the AOE.
Curse, WoWInterface

LFGStatusIcon totalpackage

Simple mod that displays LFG queue status by placing indicators on the LFG minimap icon so that you do not have to constantly mouse-over it.
WoWInterface, Curse

LiteAssist Xodiv

LiteAssist is a very basic addon to replace the standard /assist macro. It provides extra key bindings to learn who to assist and to assist them. You can (and must to use this addon) set them up via the WoW Keyboard Options menu. LiteAssist really is lite. There are no /commands and no fancy GUIs, just the 3 key bindings.
Curse

RaidAchievement Shurshik

Reports in chat (or with sound) when group or raid achievement that you can't track has failed or when all criteria of the achievement have been completed and you need to kill boss. Informs about achievements when you enter the instance or target a boss. Manual selection of achievements (by location) available. Shows tactics.
Curse

rTimeToDie zork

Calculates the time left until a boss is going die. Option for which mobtypes will be tracked (raidboss, hc boss, all mobs). Option if dps should be shown.
WoWInterface

SimplePowerBar suicidalkatt

Lightweight addon designed to replace the default Blizzard Alternate Power Bar.  It will automatically show or hide when needed.
Curse, WoWInterface