WowAce

Auto sizes frame layout depending on group/raid size or predefined zone data

Provides buttons and keybinds for raid flare world markers that never stop working mid-session

Historian

Debuff Monitor: A Powerful & Configurable Raiding Tool

Used to visualize and change values of variables/variable-trees in game

RefillRemind

Automatic ammo reloading and selection, with warnings.

TwiCo

Right-click on minimap blips to open a targeting menu (out of combat).

Target assistance by automatic rewriting of macros

WhiteboardNG

Manages the scanning of the auction house in a reliable an efficient manner.

Makes tracking reputation much simpler. By InSo(v)nIaX

SmartyCat

Angry Boss Reminders helps raiders switch to the proper talents, glyphs, and gear for each boss during a raid.

Show a texture on demand

Allows for easy congratulating when someone earns an achievement.

GearRating

FuBar_RLAssistFu

TGuildFrame