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.

zeko3991

Wikidata References will add a new field to tags and categories for adding a Wikidata Item ID to which tags and categories terms will be associated to.
Also it will provide the site admin the option to add a link to those associated Wikidata items to the head metadata section, or to the tag/category archive title.
User will also have the option to frame tag and categories archive pages links into a Schema.org 
microformat.
This plugin was developed under the requisites of a Wikimedia phabricator request at 
<a href="https://phabricator.wikimedia.org/T138371" rel="nofollow ugc">https://phabricator.wikimedia.org/T138371</a>

Wikidata References for WordPress

Really liked this plugin. Useful. Doesn't add unnecessary taxonomies. Would be interested in seeing what other features it could add. Authors with Wikipedia pages or Wikidata entries could be linked as well from their profiles. 

One of the few plugins that seems to get the core idea really well.

Very excellent

Wikidata References is a plugin developed to help WordPress users to add associations among the tags and categories they use in this WordPress website …

dig Breadcrumb vs Wikidata References for WordPress