WowAce

Frame layout manager for side panels.

Shows a countdown bar for the duration of auras (e.g. HoTs, DoTs)

Persists collapsed state of headers across wow sessions.

EBB-inspired buff bars with click-to-remove support

Tracks and announces interrupts (eg. Hit/Miss/Immune) and is also able to track and report "wasted" interrupts (those which d...

Hotkey interface for spells, macros, other clickables.

mHud_Threat

Calculates incoming damage avoidance and mitigation

Add-on that shows in a unit tooltip window a number of killed mobs of the same kind

Automatically restock items from vendors and your bank

SanityBags

Dual-box Quest Automation

LDB data source displaying character stats

WindowLib

Fade Blizzard Raid Frames

ElfReloaded

GPriceEach

Reports in the Default Chat Frame how many people does not have Well Fed effect, and who are they

Automatically and immediately cancels all in-game cinematics and movies

Adds AFK status to Grid frames.