shawfactor

I wrote this plugin as I wanted a cleaner more flexible way of serving my css and script files from a cookieles domain.

LH Cookieless Domain

Filters the css and script source attribute and moves their domain to one of your choosing

tcpteam

TCP Category Subdomains plugin can converts post and woocommerce product categories to sub-domains.
Simply Create a Posts or Product Categories. All post and product categories will be included inside the plugin page. You can choose to enable or disable them. 
You may require configuration on adding wildcard subdomain. Normally it will be configured by host, ask them if needed. It will increase the performance of site and will help in SEO. Plugin will also auto redirect to new subdomain link to avoid duplicate content issue.
[FREE] Maximum 5 post or product subdomains 
[PREMIUM] Unlimited subdomains for all post and product categories
Upgrade to <a href="https://app.thecartpress.com/plugin/tcp-category-subdomains/" rel="nofollow ugc">PREMIUM</a> to enjoy unlimited domains.
IMPORTANT 
Don’t forget to configure WildCard Subdomain.
<h3>Donations</h3>

Category Subdomains for Woocommerce by TheCartPress

TCP Category Subdomains plugin can converts post and woocommerce product categories to sub-domains.

LH Cookieless Domain vs Category Subdomains for Woocommerce by TheCartPress