Sami Ahmed Siddiqui

Search engines such as Google are using structured data markup in many ways—for example, to create rich snippets in search results. Search results with rich snippets will improve your click through rates and increase the number of visitors on your website.
This plugin helps:
<ul>
<li>Helps your site to earn rich snippets in Google’s SERP.</li>
<li>Does not depend on other plugins or external code.</li>
<li>You can configure the plugin from the settings page.</li>
<li>You can activate schema’s according to your requirement. Multiple schema types are available.</li>
</ul>

JSON Structuring Markup

JSON Structuring markup is simply the easiest solution to add valid schema.org as a JSON script in the head of posts and pages.

darrinb

Easily include raw markup languages (HTML, CSS, PHP, etc.) in posts using custom quicktags. No need to encode, the filter does it 
for you. Creates convenient “encode” buttons for post authors in the HTML editor.

JSON Structuring Markup vs WP Post Encode