Luc André

By default, WordPress adds a base prefix to taxonomy URLs — <code>/category/</code>, <code>/tag/</code>, or any custom taxonomy base. This plugin removes those prefixes and replaces them with breadcrumb-style paths built directly from the term hierarchy, giving clean, readable URLs that reflect the content structure:
<pre><code>/parent-term/child-term/post-slug/
</code></pre>
For custom post types associated with a taxonomy, the full term path is used as the permalink base. For non-hierarchical taxonomies, only the term slug is used.
It supports:
<ul>
<li>Hierarchical and non-hierarchical taxonomies</li>
<li>Custom post type permalinks built from associated taxonomy term paths</li>
<li>Automatic detection of public taxonomies (including <code>category</code> and <code>post_tag</code>) and CPTs</li>
<li>Configuration via filter for fine-grained control</li>
</ul>
The plugin works at the permalink and rewrite layer and does not modify stored slugs or post content.

Libre Breadcrumb Permalinks

Removes taxonomy base prefixes and builds breadcrumb-style permalinks from term hierarchies.

mylo2h2s

DP RDFa Breacrumb Generator is the ultimate breadcrumb plugin. It is made by an SEO for other SEO’s, who was frustrated by the fact that there weren’t any valid alternatives.
Key features of this plugin:
<ul>
<li>
Is 100% based on Google’s suggestions (<a href="https://support.google.com/webmasters/answer/185417?hl=en" rel="nofollow ugc">click here for more details</a>)
</li>
<li>
Works in every possible scenario: pages and sub-pages, categories and sub-categories, tags, posts (in this case, it can even handle posts with multiple categories, showing different breadcrumbs with the v:child markup, as Google suggests)
</li>
<li>
Google’s Structured Data Testing Tool always says that everything is perfect (take a look at the results of one of my italian posts <a href="https://www.google.com/webmasters/tools/richsnippets?q=http%3A%2F%2Fwww.danilopetrozzi.it%2Fone-time-pad-messaggi-criptati-inattaccabili-a-prova-di-nsa&hl=en" rel="nofollow ugc">here</a>)
</li>
<li>
The RDFa markup is well handled by Google: in just a few days/weeks, every page will have it’s own breadcrumb rich snippets in search results pages. (see screenshots)
</li>
<li>
A rich options page allows you to set where the breadcrumbs will show and “how”
</li>
<li>
Visually customizable thanks to specific CSS classes added to every single element
</li>
<li>
If you need a breadcrumb plugin for SEO purposes, that’s what you were looking for 🙂
</li>
</ul>

DP RDFa Breadcrumb Generator

A RDFa breadcrumbs generator, specifically made for SEO purposes, that works in every scenario and displays the correct rich snippets in Google.

Libre Breadcrumb Permalinks vs DP RDFa Breadcrumb Generator