digrart

This plugin generates breadcrumb navigation for all posts, pages, custom post types, categories, and taxonomies on WordPress. The breadcrumbs are fully customizable and support structured data formats such as Microdata and JSON-LD for better SEO.

dig Breadcrumb

Generate breadcrumb navigation for all posts, pages, custom post types, categories, and taxonomies on WordPress, considering their publication status.

tormorten

Lets you add blocks of microdata using shortcodes.
<pre><code>[microdata type="http://schema.org/Article"]
[md_item prop="articleBody" element="p"]Lorem ipsum and so forth[/md_item]
[/microdata]
</code></pre>
Simply add the shortcodes using the bundled TinyMCE-plugin which is placed in the visual editor.

WP Microdata

Easily add microdata elements to your posts and pages using shortcodes.

dig Breadcrumb vs WP Microdata