cedbv

Don’t Work in WordPress MU. WordPress 3 only. 
Usefull only if you have a multisite install and if some users manages more than one blog.
This plugin adds a simple dropdown menu in administration header that allows you (and every site users) to switch 
between administration of every site they are member of (and so work for super-admin, admin, contributors,…).
Work best if the plugin is Network Activate.

Multisite Switcher

In a multisite configuration, add a dropdown menu in administration to let you switch between sites admin.

Nashwan D

Conditional Themes is an API to switch the themes on certain conditions.
<h4>Usage</h4>
Write an another plugin file and use the Conditional Themes API as the example below:
<pre><code>add_action('plugins_loaded', 'my_conditional_themes_setup', 100);

function my_conditional_themes_setup()
{
 // Switch to Twenty Eleven theme if the visitor use Internet Explorer.
 Conditional_Themes_Manager::register('twentyeleven', function() {
 global $is_IE;
 return (bool) $is_IE;
 });

 // Switch to Twenty Thirteen theme if the user has administrator role.
 Conditional_Themes_Manager::register('twentythirteen', function() {
 return current_user_can('administrator');
 });

 // Switch to a custom theme if the visitor use a mobile device.
 Conditional_Themes_Manager::register('mobile', 'wp_is_mobile');
}
</code></pre>
Another example, With enabling persistent mode.
<pre><code>add_action('plugins_loaded', 'my_conditional_themes_setup', 100);

function my_conditional_themes_setup()
{
 // Enable the switcher persistent mode.
 Conditional_Themes_Manager::set_option('persistent', true);

 // Switch to Twenty Sixteen theme when we being on 2016.
 Conditional_Themes_Manager::register('twentysixteen', function() {
 return (date('Y') == 2016);
 });

 // Switch to Twenty Fifteen theme when the site reaches 500 post.
 Conditional_Themes_Manager::register('twentyfifteen', function() {
 return ((int) wp_count_posts() > 500);
 });
}
</code></pre>
Note: You can use <a href="https://wordpress.org/plugins/code-snippets" rel="ugc">Code Snippets</a> plugin to add the code snippets to your site.
<h4>Contributing</h4>
Developers can contribute to the source code on the <a href="https://github.com/nash-ye/WP-Conditional-Themes" rel="nofollow ugc">Github Repository</a>.

Conditional Themes

Keep up the good work. Plugin exactly doing what it should do. Perfect :)

Awesome Plugin. Neat and Accurate

A simple API to switch the themes on certain conditions.

Multisite Switcher vs Conditional Themes