WowAce

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

Sheppard

Shows Chat as Combat Text

quick quest turnin and acceptance with a shared keybind

Quest helping: fetching items to use, that sort of thing.

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

TrackingBar

LilSparky's Workshop mod for Trade Skills

EUF is an enhance of wow original unit frames, provides hp with both value and %, and optional 3D portrait. Simple and Useful.

Allows the user to customize the the tooltip with lua-scripts

Enable/Disable addons for your character in game

AspectsBar

CharScanner scans Basic Character Data, Talent Specifications, Equipment, PvE/PvP Achievements, PvE Boss Kill Statistics and ...

Adds unreal tournament style sounds to PvP encounters.

Buffalo

Prints a message in your default chat frame when someone in your group gains an aura.

LibRock-1.0

First Aid data for Ackis Recipe List.

NabuFiveSec

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