WowAce

CombatLog in SimpleCombatlog style

Speeds up triggering actions such as items or spells by triggering them on key/mouse down rather than release

Target Debuff monitor. Stacking aware, giving current and potential debuff status.

Allows you to create icons, which can be customized greatly by user's input. CiR is more than just the usual cooldown tracker.

aX_RaidStatus

Generates and posts random Chuck Norris facts to a specified chat medium.

Monitors the combatlog identifying players from the oposite faction near you.

BanzaiLib

RangeRecolor

Battleground Timers in a HUD around the Blizzard BG status

Automatically invites player from templates.

Displays Pet Info for Hunters and Warlocks. Also keeps track of Stables and Pet and Demon skills.

Instant SLAM! notification

FuBar_RaidBuffFu

Test whether the player can really dispell a buff or debuff, given its talents.

Allows you to browse your clients database

Simple and clean Death Knight displays

Fancy up the ExtraActionButton frame

LDB display for Oak Interrupts Broker

FuBar_ItemDBFu