WowAce

Enables user defined sounds for Party, Guild, Raid and Custom Channel chat messages.

GrindStatus

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

mHud

Simple and clean Death Knight displays

RS_ClassColors

HazLoot

FuBar_WhisperFu

Helper functions used by my addons, feel free to use them in your addon too

A simple interface for unitframe click casting.

BankAccountant

Note + rep tracking for players, with guild data sharing.

Heal and decurse by clicking on customizable raid/party unit frames

Save and load macros.

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

Uses guild notes to add alts' main names to chat windows and other places

Adds 3 indicators to each side (top, bottom, left and right).

Scans your Equipment for cumulative item bonuses and sums them up.

ChatHighlighter

Track any items you want in a tooltip