Backbone.Marionette

Backbone.Marionette, currently at stable version 4.1.3, is a composite application library designed to bring architectural patterns, view management, and memory management to applications built with Backbone.js. It provides a structured approach to developing large-scale single-page applications by offering components like `Application`, `Region`, `View`, and `CollectionView`. While Backbone offers core building blocks, Marionette extends these with sensible defaults, an event-driven architecture via Backbone.Radio, and built-in lifecycle management, including "zombie-killing" for views. This specific package (`backbone.marionette`) is currently in maintenance mode, with its development limited to bug fixes. All new feature work for the framework has transitioned to a new, dependency-agnostic `marionette` package (v5+), which no longer relies on Backbone. This `backbone.marionette` package requires Backbone v1.3.3+ and Underscore v1.8.3+ as peer dependencies, ensuring its compatibility within the Backbone ecosystem.