The Jake Group

The purpose of this plugin is to facilitate deployment of subdomain links to 
landing pages on a WordPress website. The plugin automatically maps subdomains 
to page and post permalinks based on the post_name field in the database. 
There are no administrative settings.
This plugin DOES NOT edit DNS zone files. Subdomain DNS records themselves 
either need to be set up individually or as a wildcard record in the DNS zone 
file to map to the website directory. Once the request reaches the WordPress 
system, the plugin will automatically check to see if the subdomain matches a 
page or post name. If so, the WordPress query is edited to get that page/post 
at its permalink. The WordPress siteurl is excluded, as is the naked 
second-level domain.
Example mappings:
URL → Mapping 
http://example.com → default homepage (no remapping) 
http://www.example.com → default homepage (no remapping) 
http://test-page.example.com → example.com/test-page/ 
http://mypost.example.com → example.com/mypost/

Automatic Subdomains

Automatically maps subdomains to page and post permalinks based on post slug.

lontongcorp

casualgenius

selnomeria

An updated modification of “<a href="https://wordpress.org/extend/plugins/wordpress-subdomains/" rel="ugc">WP Subdomains</a>” 0.6.9 to make subdomains for Categories, Pages and Authors without or inside Multisite. 
The original description is at <a href="https://wordpress.org/extend/plugins/wordpress-subdomains/" rel="ugc">original plugin’s page</a>, but you MUST also read <a href="other_notes/" rel="nofollow ugc">INSTRUCTIONS</a> sections.
Works perfectly as CDNs, likewise with <a href="https://wordpress.org/extend/plugins/w3-total-cache/" rel="ugc">W3 Total Cache</a>, to increase performances without any additional technical problems.
<h4>Features</h4>
<ul>
<li>Setup main categories as subdomains</li>
<li>Setup main pages as subdomains</li>
<li>Setup author archives as subdomains</li>
<li>Custom themes for each subdomains</li>
<li>Tie pages to categories</li>
<li>Contextual help screen</li>
<li>Widgets</li>
<li>Localization</li>
</ul>
<h3>Instructions</h3>
Read the original instructions at <a href="https://wordpress.org/extend/plugins/wordpress-subdomains/" rel="ugc">Original Plugin</a>. 
Read the instructions on plugins help screen on plugins backend.
<h3>Credits</h3>
<ul>
<li><a href="http://www.lontongcorp.com" rel="nofollow ugc">Erick Tampubolon</a> of <a href="http://www.igits.co.id" rel="nofollow ugc">IGITS</a> (Author)</li>
<li><a href="https://profiles.wordpress.org/selnomeria" rel="nofollow ugc">selnomeria</a> (Commiter)</li>
<li><a href="http://demp.se/y/2008/04/11/category-subdomains-plugin-for-wordpress-25/" rel="nofollow ugc">Adam Dempsey</a> (Contributor)</li>
<li><a href="http://blog.youontop.com/wordpress/wordpress-category-as-subdomain-plugin-41.html" rel="nofollow ugc">Gilad Gafni</a> (Contributor)</li>
<li><a href="http://casualgenius.com" rel="nofollow ugc">Alex Stansfield</a> of <a href="http://casualgenius.com" rel="nofollow ugc">Casual Genius</a> (Original Author)</li>
<li>Based on the <a href="http://www.biggnuts.com/wordpress-subdomains-plugin/" rel="nofollow ugc">Subster Rejunevation</a> wordpress plugin by <a href="http://www.biggnuts.com/" rel="nofollow ugc">Dax Herrera</a>.</li>
</ul>

WP Subdomains (Revisited)

Setup your main categories, pages, and authors as subdomains with custom themes. Surely will come for more options...

Automatic Subdomains vs WP Subdomains (Revisited)