Josh Pollock

Use this plugin to create a demo site for your themes, or use it to allow users to customize the presentation of your site.
The JP Theme Bar Plugin adds a theme switching bar to the bottom of your site, perfect for theme preview sites. The settings page for the plugin lets the end user choose which themes to add, as well as set the colors for the theme bar. You can see it in action on this site.
New in version 0.0.3 -> Themes will update theme mods when changing themes allowing for individual theme settings to be previewed properly.
This plugin is based on the <a href="http://iainjmccallum.com/wordpress/live-demo-theme-bar/" rel="nofollow ugc">IJM Theme Switcher Bar v2.0</a> by <a href="http://www.iainjmccallum.com/" rel="nofollow ugc">Iain J McCallum</a>
IMPORTANT- The plugin <a href="https://wordpress.org/plugins/theme-test-drive/" rel="ugc">Theme Test Drive</a> by <a href="http://www.prelovac.com/vladimir/" rel="nofollow ugc">Vladimir Prelovac</a> must be installed and activated in order for the theme switching to work.

JP Theme Switcher Bar

Adds a theme switcher/ theme demo bar to the bottom of your site to allow users to switch the theme they see on your site.

Niels Lange

SMNTCS Theme Toggle is a lightweight and efficient WordPress plugin designed to streamline theme management. It adds a convenient theme switcher to the WordPress admin bar, enabling administrators and developers to quickly switch between installed themes without navigating away from their current page.
This plugin is particularly useful for: 
* Theme developers who need to test different themes 
* Site administrators who frequently switch between themes 
* Anyone who wants a more convenient way to manage themes
<h4>Features</h4>
<ul>
<li>Quick theme switching from the admin bar</li>
<li>Maintains current page context after theme switching</li>
<li>Responsive design with multi-column layout</li>
<li>Visual indicators for active theme</li>
<li>Secure theme switching with nonce verification</li>
<li>Clean and modern user interface</li>
<li>Supports all WordPress themes</li>
</ul>
<h4>Security</h4>
The plugin implements several security measures: 
* Nonce verification for theme switching 
* Capability checks (only users with <code>manage_options</code> can access) 
* Proper sanitization of URLs and data

SMNTCS Theme Toggle

A powerful WordPress plugin that adds a theme switcher to the admin bar, allowing administrators to quickly switch between installed themes without le …

JP Theme Switcher Bar vs SMNTCS Theme Toggle