This page describes fan-made scripting using the World of Warcraft API which has had notable impact on the game's development/history.
Deadly Boss Mods is a boss alert mod. It consists of many individual "boss modules", mini addons that are designed to trigger alert messages and timer bars for one specific raid boss each. Instance modules will be loaded and enabled when you enter the corresponding instance. In most cases only one module will be running at any given time.