mosheeshel

This plugin extends Theme Switcher and Theme Switcher Reloaded, this plugin detects the existing active plugin and uses it to display a floating list of available themes, to enable creating a Theme demo site.
Basically it enables anyone to create a demo site of all his available themes, just create a site with all the demo pages you can think of. The download and Enable either Theme Switcher or Theme Switcher Reloaded plugins, and this plugin, and when you access any page on the site a floating div will appear on the top left side of the site, showing a dropdown menu wutg the current theme selected. When you choose a different theme from the list, the site will switch to have that theme as the selected site theme.
Note: that this plugin is dependant on either the Theme Switcher or the Theme Switcher Reloaded plugins, and what it does would not be possible without the work done on those plugins.

Floating Theme List

This plugin extends Theme Switcher (/Reloaded), it displays a floating list of available themes, enabling EASY creation of a theme demo site.

Elementor

Hello+ is a free WordPress plugin designed to work seamlessly with Elementor’s <a href="https://profiles.wordpress.org/elemntor/#content-themes" rel="nofollow ugc">Hello suite of themes</a>. It provides a solid foundation for crafting unique, purpose-driven websites using Elementor’s drag-and-drop site builder.
Hello+ includes specialized Hello widgets such as a Header, Footer, Zigzag, Form Lite, and more. Hello widgets help you build faster and create polished, professional websites.
To use Hello+, you’ll need to <a href="https://profiles.wordpress.org/elemntor/#content-themes" rel="nofollow ugc">install one of Elementor’s Hello suite of themes</a>.
<h3>Copyright</h3>
This Plugin, like WordPress, is distributed under the terms of GPL. 
Use it as your springboard to building a site with Elementor.

Hello Plus

Hello+ is a free WordPress plugin designed to work seamlessly with Elementor’s Hello suite of themes.

Floating Theme List vs Hello Plus