Amit Agarwal

Sitemaps are a way to tell Google, Bing and other search engines about web pages, images and video content on your site that they may otherwise not discover.
The Mobile Sitemap plugin will generate a sitemap for your WordPress blog with URLs that serve mobile web content.
Do I need a XML Mobile Sitemap?
According to Matt Cutts of Google, you may not need a separate Mobile Sitemap if your WordPress blog is using <a href="http://www.labnol.org/internet/responsive-web-design-faq/21361/" rel="nofollow ugc">Responsive Web Design</a> where the same page is served to both desktop and mobile screens. Everyone else may need one.
It is also recommended that you add a rel=canonical tag in your mobile pages that point to the original URL.
Related WordPress plugins:
<ul>
<li><a href="https://wordpress.org/extend/plugins/google-image-sitemap/" rel="ugc">Google XML Sitemap for Images</a></li>
<li><a href="https://wordpress.org/extend/plugins/xml-sitemaps-for-videos/" rel="ugc">Google XML Sitemap for Videos</a></li>
</ul>
WordPress Resources:
<ul>
<li><a href="http://www.labnol.org/software/must-have-wordpress-plugins/14034/" rel="nofollow ugc">Must have WordPress Plug-ins</a></li>
<li><a href="http://www.labnol.org/internet/improve-wordpress-security/24639/" rel="nofollow ugc">Improving WordPress Security</a></li>
</ul>
The Sitemap plugins are written by <a href="http://www.labnol.org/about/" title="Amit Agarwal" rel="nofollow ugc">Amit Agarwal</a> of <a href="http://www.labnol.org/" title="Tech Blog" rel="nofollow ugc">Digital Inspiration</a>. For support, you can leave a comment in the <a href="https://wordpress.org/support/plugin/google-mobile-sitemap" rel="ugc">WordPress forum</a> or send a tweet to <a href="http://twitter.com/labnol" rel="nofollow ugc">@labnol</a>.

Google XML Sitemap for Mobile

This WordPress plugin will generate an XML Mobile Sitemap for your WordPress blog.

Joost de Valk

This plugin adds an XML sitemap for PDFs. It adds this XML sitemap to the <code>sitemap_index.xml</code> that Yoast SEO generates. 
It has no settings.
<h3>Have you found an issue?</h3>
If you have bugs to report, please go to <a href="https://github.com/jdevalk/pdf-xml-sitemap" rel="nofollow ugc">the plugin’s GitHub repository</a>. For security issues, please use our <a href="https://patchstack.com/database/vdp/pdf-sitemap" rel="nofollow ugc">vulnerability disclosure program</a>, which is managed by PatchStack. They will assist you with verification, CVE assignment, and, of course, notify us.

XML Sitemap for PDFs for Yoast SEO

This plugin creates an XML sitemap for the PDFs in your uploads folder. It requires Yoast SEO.

Google XML Sitemap for Mobile vs XML Sitemap for PDFs for Yoast SEO