poxrud

This plugin generates Structured Data Schema in JSON-LD format. This could potentially improve your site’s visibility and SEO.
To learn more about Structured Data and Schema please visit Google’s <a href="https://developers.google.com/search/docs/guides/intro-structured-data" rel="nofollow ugc">Introduction to Structured Data</a>.
Make sure to test your website’s structured data using the <a href="https://search.google.com/structured-data/testing-tool" rel="nofollow ugc">Structured Data Testing tool</a>.
While there are hundreds of differet Schema types this plugin’s focus is on those types that releate to Product based businesses.
Currently as of version 1.0.0 the plugin supports the following Schema types:
<ul>
<li><a href="http://schema.org/WebSite" rel="nofollow ugc">WebSite</a></li>
<li><a href="https://developers.google.com/search/docs/data-types/corporate-contacts" rel="nofollow ugc">Organization</a></li>
<li><a href="https://developers.google.com/search/docs/data-types/products" rel="nofollow ugc">Products</a></li>
<li>New types will be added in future versions.</li>
</ul>
NOTICE: This plugin is offered free of charge. It has been written by <a href="https://www.twitter.com/poxrud" rel="nofollow ugc">Phil Oxrud</a>.
<h4>Features</h4>
<ul>
<li>Specifically Tailored for Google’s structured data schema</li>
<li>WebSite Schema</li>
<li>Organization Schema</li>
<li>Indicate multiple contact phone numbers using schema</li>
<li>Indicate multiple social media accounts using schema (twitter, facebook, and youtube)</li>
<li>Supports Products Schema</li>
<li>Generate defaults or customize the schema of every individual product.</li>
</ul>

Business Schema JSON-LD

Generate Structured Data in JSON-LD format for Product based businesses. Supports popular schema.org types that would be commonly used by a typical bu …

Tim van Iersel

Adds custom field to the post & pages editor for custom JSON-ld schema markup also known as structured data. The plugin also validates if the JSON is formated correctly. <a href="http://coderisk.com/wp/plugin/websitescanner-custom-schema/RIPS-8iSfZmxGFd" rel="nofollow ugc"></a>
Add your own JSON-ld on every page, post and custom post without the <code><script></code> to show your own custom Schema markup.
Works well with the following plugins:
<ul>
<li><a href="https://wordpress.org/plugins/remove-schema/" title="Remove Schema WordPress plugin" rel="ugc">Remove Schema</a></li>
</ul>
Usecases:
With the combination of the WordPress plugin it’s easy to overwrite the schema on a specific page. 
If a plugin like Yoast SEO or other plugin or theme that generates schema you can disable the schema and add your own custom schema to the page.

Websitescanner Custom Schema

Adds custom field to the post & pages editor for custom JSON-ld schema markup also known as structured data.

Business Schema JSON-LD vs Websitescanner Custom Schema