Nick van de Veerdonk

Authors need love, also in your AMP posts! Having an attractive author section makes stuff just a little warmer on the web and with your contact information prominently featured you’ll connect to your readers/customers all the better. Select the options you want in the plugin options page, which will produce some new fields in your profile page where you will be enable to add:
<ul>
<li>Up to 4 social media accounts</li>
<li>Link to website</li>
<li>Link to WordPress profile</li>
<li>Icon with email link</li>
<li>Author name (standard, linking to author archive)</li>
<li>Short description (standard)</li>
<li>and Avatar if available</li>
</ul>
You can give it some personal flavour by setting a custom color to the links in the AMP Author Box.
Furthermore all information is passed to the Author property in the generated JSON-LD code. In addition to the ‘name’ property is added:
<ul>
<li>sameAS (social media accounts and WordPress profile)</li>
<li>email</li>
<li>description</li>
<li>url (for website)</li>
</ul>
And just for fun we have added the option to implement 3 property-value instances of your own, if you so desire. See screenshot 4.
Since there’s no use in having different author boxes for regular and AMP content you are able to use it on both with the tick of a single checkbox. Structured data of this box is marked up by use of schema.org markup.
For your convenience we provide handy Google Structured Data Testing Tool and AMP validation tool bookmarklets from within the plugin options page.
We have made this plugin with performance in mind, options you don’t want won’t be used. Plugin does not use Javascript or images, icons are rendered via HTML symbols.
<blockquote>
We aim to provide you with a usefull plugin, if in any way you experience difficulties or inconsistencies kindly <a href="https://jaaadesign.nl/en/blog/amp-author-box/" rel="nofollow ugc">let us 
 know</a>, thank you!
</blockquote>
This plugin is actively maintained but will not be supported. I will however try to answer any questions in the comment section of the <a href="https://jaaadesign.nl/en/blog/amp-author-box/" rel="nofollow ugc">plugin website</a> and create a FAQ here in the repository.
With thanks to <a href="http://www.wpbeginner.com/" rel="nofollow ugc">wpbeginner.com</a> for their excellent tutorials.
Be sure to check out our other AMP plugins!

AMP Author Box

Extends the AMP plugin (Automattic) by adding a customizable, handsome and Structured Data marked up author box to your website.

An HTML sitemap is a list of names and links of your pages and posts in the front end of your website. It can be useful for users to get a good overview of the content you’re presenting. For bots it is equally useful since the internal links send them to the farest corners of your website, which could help indexation greatly.
Strictly taken AMP does not need a sitemap (HTML or XML) if the content is marked up correctly: engines know where AMP content is by this piece of code present in your regular pages:
<pre><code><link rel="amphtml" href="https://www.example.com/url/to/amp/document.html">
</code></pre>
That being said there could be several reasons to use an AMP HTML Sitemap:
<ol>
<li>
You want your AMP content to be indexed faster and more regulary. In case you don’t have much traffic, external links or good internal linking structure indexation could take a while. An HTML sitemap will improve your internal links and if you add the URL of the sitemap to your current XML sitemap plugin, search engines will gain information on the AMP content by automatic submission of your XML sitemap. (see ‘Addditonal tips’ under installation tab)
</li>
<li>
You have ‘stand alone’ AMP content. Seen as there are no links pointing to content that is only reachable by AMP (because they miss the link from the regular page and naturally don’t occur in menus) it can take a long time for them to be indexed.
</li>
<li>
You have an HTML sitemap for regular content and simply wish to add your AMP content to it
</li>
</ol>
And in that case, this lightweight plugin is for you.
This plugin will not be supported, I will however try to answer all question in the comment section of the <a href="https://jaaadesign.nl/en/blog/amp-sitemap/" rel="nofollow ugc">plugin website</a> and create a FAQ.
Matt Cutts on HTML and XML sitemaps 
<iframe class="youtube-player" width="640" height="360" src="https://www.youtube.com/embed/hi5DGOu1uA0?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation"></iframe>

AMP HTML Sitemap

Only four stars so far, because although the description  says it does posts and pages, I only get posts.

This plugin worked well. After adding the shortcode to my existing sitemap page, there were new links appended with /amp to the AMP posts.  

Great idea for a plugin, and I just now submitted the sitemap page to "Fetch as Google" in the Search Console. I can't yet say if it will speed up Google's  discovery, but I do suspect it will.

***Update*** 
In 24 hours, AMP pages in Google's index went from "none found" for three domains, to well over 50%.  Clearly this plugins does what it's intended to do - helps Google get AMP pages indexed faster.

Worked Perfectly

The links have incorrect endings.
Should be:
site.url/stat-name.html

Actual result:
site.url/stat-name.htmlamp

The links have incorrect endings

Generates a customizable list of your AMP posts, pages and custom post types for SEO/indexing benefits, to be added to the content by shortcode.

AMP Author Box vs AMP HTML Sitemap