WowAce

Automatically sells low quality gray items and selected white items to the vendor.

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

Dynamically atering layout in raid environment (Tanks, Ranged / Melee DPS, Healers)

Calculates optimal reforging for given weights/caps.

Shows the price of a single item in the Auction House.

Lexan

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

Rewrite myBindings. An enhanced key bindings interface.

A Data Broker plugin to show AddOn memory usage.

Capsule

StatStain

TGuildFrame

Historian

Target assistance by automatic rewriting of macros

TwiCo

Calculates incoming damage avoidance and mitigation

Puts a timer in /yell when you get Unbound Plague during the Heroic Professor Putricide encounter

WeaponRebuff

Automatic ammo reloading and selection, with warnings.

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