CyanSmoker

<ul>
<li>Keep updated! http://nexus.zteo.com/</li>
<li>This plugin can be used to display a different theme for each page of your blog.</li>
<li>This plugin can be used to display a different theme for each one of your blog posts.</li>
<li>The interface used to configure this is very user-friendly. Even friendlier since v1.3.</li>
<li>Many thanks to Stephen Carroll whose domain page’s script motivated me to write this plugin.</li>
<li>Thanks also go to emposha.com for their image selection script, which I shamelessly hacked and surely made worse.</li>
</ul>
<h3>Limitations</h3>
<ul>
<li>Due to WordPress selecting themes and stylesheets very early on when building a page, I cannot use WordPress’ “official” way to detect the current page/post. Therefore, you may find that this plugin does not work correcly if your setup is extremely exotic. Contact me if this happens.</li>
</ul>

Page Theme

Specify the theme (not template, that is already taken care of by Wordpress) you wish to use with each given page or blog post.

zxial

This plugin provides JSON data to mobile APPs. Here’s the scenarios that you 
could use this plugin: you want to develop a mobile app or app on mac, and the 
app is to show the list of your blogs(in category, tag, or keywords), after 
the app user click one item in the blog list, you would like to show him the 
detail page of the item, but the logos/banners/sidebar of blog is suitable 
only for a desktop other than a mobile device or you want to do something 
different. In the case here, wp_app_json mayble could help.
Code: 
Author: Zxial 
Web: http://zxial.me

WP APP JSON

The WP-APP-JSON is a plugin that provide json data to mobile apps, you can use keywords to search your posts and get detail webpage.

Page Theme vs WP APP JSON