A highly configurable jQuery UI dialog widget that supports minimize/maximize, resize, tab stop management, modal mode, and customizable header buttons. It is decoupled from elFinder's core and can be extracted for use in other web applications with minimal adaptation.

A dynamic context menu jQuery plugin that generates menus from command definitions, supports submenus, keyboard navigation, touch events, and auto-hide. The pattern of building menus from a data structure is reusable in any application needing contextual actions.

The abstract base class for all storage backends (local, FTP, cloud, etc.). It defines a consistent interface for filesystem operations (stat, read, write, mkdir, unlink, etc.) and handles common concerns like path normalization, MIME detection, and thumbnail generation. This pattern can be reused to implement new storage adapters for any file management system.

A base class for server-side plugins that hook into elFinder's command lifecycle (e.g., upload.presave, rename.pre). It provides per-volume configuration, modifier key detection, and event binding. The plugin architecture is cleanly separated and can be adapted for other PHP applications needing extensible event-driven behavior.