Dougal Campbell

By default, the only way to see how a new theme looks on your site is to 
activate it, making it visible to everyone who visits. With this plugin, it 
is possible to view how a new theme looks without activating it.
<h3>TODO</h3>
Possible future enhancements:
<ul>
<li>Add an options screen.</li>
<li>Allow choice of theme to preview from a known list of installed themes.</li>
<li>Provide persistent previews by setting a cookie.</li>
<li>Restrict preview ability by user Roles/Capabilities.</li>
<li>Child-theme friendliness.</li>
</ul>
<h3>Notes</h3>
May not work properly with child themes. This is because it will not be able 
to inherit from the parent theme as it normally would.

Theme Preview

Allows you test how a theme looks on your site without activating it.

Dan Rossiter

This plugin, like most things useful, grew out of a need. I had a <a href="http://www.prezi.com/recommend/qv1ms7qvtplw" rel="nofollow ugc">Prezi</a> 
and I had a WordPress blog. I Googled for a few hours, trying to find a way to embed one within the other, and found some 
dirty hacks that ended up not working, as well as a plugin or two that didn’t work, or only half worked. When I realized 
that there were no good solutions for this issue, I decided to create one.
This plugin is based on simplicity, making it extremely robust. On the back end, it is actually only a few lines of code. 
It takes the embed code that Prezi provides when clicking the share option through their site and simply inserts the 
necessary values that are needed to render a working Prezi.
I hope that you all find this plugin as useful as I have!
If this plugin has been helpful, please take a moment to 
<a href="https://wordpress.org/support/view/plugin-reviews/prezi-embedder#postform" rel="ugc">rate it</a>!

Prezi Embedder

This plugin allows the user to quickly & easily embed a Prezi in WordPress site by directly implementing the published iframe embed code.

Theme Preview vs Prezi Embedder