Reactive version of WinBox provides ability to create multiple popup/modals and still have option to minimize and work on background.

WinBox is a modern HTML5 window manager for the web. Lightweight, outstanding performance, no dependencies, fully customizable, free and open source! Features include

1. Multiple modal
2. Customizable
3. Minimize/Maximize/fullscreen modal window
4. Option to interact with background

Reactive version of WinBox JS (https://github.com/nextapps-de/winbox)