WowAce

Spell overlay customization and spell state HUD.

OneBag is a replacement for the default game bags that combines all the bags into one frame.

Shows loot information in item tooltips

KTMCPUManager

SeeingRed

Customize the appearance of the chat bubbles.

Fancy up the PlayerPowerBarAlt frame

Hotkey interface for spells, macros, other clickables.

Lets you drag UI frames around

Fade Blizzard Raid Frames

LDB data source for reputation monitoring.

A Data Broker plugin to display how long you've been playing

A lib to manage action bar and timers

Shows a window displaying any raid member below 10,000 health during the Chimaeron encounter.

Automatically invites player from templates.

Fubar Plugin for Simple Soulstone

Expiration

Allows for easy congratulating when someone earns an achievement.

Adds a highlight border to items in your MogIt Wishlist, making them easier to see.

Lists and/or reminds people missing flasks or food buffs at every ready check.