Simon Wheatley

A plugin providing template tags to list all active (or inactive) authors in the WordPress installation.
<pre><code><?php list_active_authors( 'days=30&include_protected_posts=0' ); ?> Will list all the authors active in the last 30 days, not counting password protected posts as "activity". Both parameters are optional.

<?php list_inactive_authors( 'days=30&include_protected_posts=0' ); ?> Will list all the authors NOT active in the last 30 days, counting password protected posts as "activity". Again, both parameters are optional.
</code></pre>
If “days” are not provided the tags default to the last 30 days. 
If “include_protected_posts” is not specified, the tags default to not including password protected posts.
The HTML output is fairly heavily classed, but if you need to adapt it you can. Create a directory in your theme called “view”, and a directory within that one called “author-listings”. Then copy the template files <code>view/author-listings/active-authors-list.php</code> and/or <code>view/author-listings/inactive-authors-list.php</code> from the plugin directory into your theme directory and amend as you need. If these files exist in these directories in your theme they will override the ones in the plugin directory. This is good because it means that when you update the plugin you can simply overwrite the old plugin directory as you haven’t changed any files in it. All hail <a href="http://urbangiraffe.com/" rel="nofollow ugc">John Godley</a> for the code which allows this magic to happen. Can hook into the <a href="https://wordpress.org/extend/plugins/user-photo/" rel="ugc">User Photo plugin</a> to display the author photos.
Plugin initially produced on behalf of <a href="http://www.puffbox.com" rel="nofollow ugc">Puffbox</a>.
Is this plugin lacking a feature you want? I’m happy to accept offers of feature sponsorship: <a href="http://www.simonwheatley.co.uk/contact-me/" rel="nofollow ugc">contact me</a> and we can discuss your ideas.
Any issues: <a href="http://www.simonwheatley.co.uk/contact-me/" rel="nofollow ugc">contact me</a>.

Author Listing

Allows listing of authors who are active or inactive within a defined recent period of time.

redlettuce

WP Word Count tells you exactly how many words you’ve written on your site with statistics by month and author.
New in Version 3.2.0: Reading Time 
WP Word Count now comes with built in reading time statistics for each post and page of your site. Find out how many hours of content you’ve written or let readers know how long your articles are. You can include reading time at the top of each of your posts automatically or use a shortcode.
<h3>FEATURES</h3>
<ul>
<li>Quickly see how many posts and pages you’ve created and how many total words they add up to.</li>
<li>View and display estimated reading times for each piece of content on your site.</li>
<li>Support for custom post types so you can monitor word counts from content created by your themes and plugins.</li>
<li>View your writing output for each month broken down by post type.</li>
<li>See all of your site author’s word counts with breakdowns by post type.</li>
</ul>
<h3>WP WORD COUNT PRO</h3>
Upgrade to <a href="https://wpwordcount.com" rel="nofollow ugc">WP Word Count Pro</a> and get additional features to help you understand and analyze the amount of content you are producing for your site:
<ul>
<li>Control which post types and statuses you see in your statistics through custom “Settings” options.</li>
<li>Get detailed breakdowns of your monthly writing output by day, author, post type, category, tag and more.</li>
<li>View individual author details with information beyond just word count totals.</li>
<li>See expanded post details with revision history, site rankings and more.</li>
<li>Motivate yourself with the built-in achievement system to write more and increase your site’s content.</li>
<li>View charts and graphs for better data visualization and understanding.</li>
</ul>
You can learn more about WP Word Count Pro at <a href="https://wpwordcount.com" rel="nofollow ugc">wpwordcount.com</a>

WP Word Count

Count the words on your WordPress site instantly.

Author Listing vs WP Word Count