Addons

1. Details! (Streamer Plugin) - https://www.curseforge.com/wow/addons/details

2. Exorsus Raid Tools (Fight Timer, Cooldown Tracker, Battle Rez Tracker, Raid Notes) - https://www.curseforge.com/wow/addons/exorsus-raid-tools

3. SUF - https://www.curseforge.com/wow/addons/shadowed-unit-frames.

4. Cell - https://www.curseforge.com/wow/addons/cell

5. Details! - https://www.curseforge.com/wow/addons/details

6. SexyMaps - https://www.curseforge.com/wow/addons/sexymap

FrameColor - https://www.curseforge.com/wow/addons/framecolor-hud-action-bar-color

 

Not pictured:

Raid/Dungeon Warnings: BigWigs / LittleWigs

Bag Addon: Baganator

Circular Keybind Addon: OPie 

Keystone Addon: Angry Keystones 

Raid Loot Addon: RC Loot Council

Nameplates: KUINameplates

Others: MouseoverActionSettings | MoveAny

 

WeakAuras

WeakAuras are useful for tracking of buffs, debuffs, and specific events in an encounter.  

7. Luxthos' Priest WeakAuras - https://wago.io/BJu2WDqBX.  Also styles available for other healing classes.

8. Combat Timer - https://pastebin.com/TTnhchqM