WowAce

Status indicator that shows if a unit is hostile (probably mindcontrolled)

LibRockTimer-1.0

Animated target indicator

IDCard

Show a bar indicating the unit's Holy Power count.

Shared handling of media data (fonts, sounds, textures, ...) between addons.

Collects and displays census information. This AddOn is licenced under the GNU GPL, see GPL.txt for details.

Aiue's Luck Point Handling Addon

oUF element for highlighting debuffs that are dispellable by the player

Adds Buff/Debuff icons to the grid frame.

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

Small Box Icon Pack for Cartographer

Adds AFK status to Grid frames.

Add-on that shows which battle pets can be farmed this week

Displays reagent count on spell action buttons

DKP ingame management

kgPanelsConfig

ezIcons

A library which provide tools for detecting adverse effects on units.

SeeingRed