Ryan

Adds a shortcode, series-tag, that you can use to create a list of all posts 
that are tagged with whatever tag you pass in.
Series Tag was written to allow you to tag a series of posts with the same tag, 
and then easily link between them without having to manually create links at the 
bottom of each post.
Links are created in date published order starting at the earliest date. All post 
titles are links to the permalink of the post except for the current post which just has its title displayed.
For help or more info, visit <a href="http://www.nutt.net/tag/series-tag/" rel="nofollow ugc">Nutt.net</a>

Series Tag

Adds a shortcode so you can easily create a list of all posts with a specific tag. Written to make it easy to link between a series of posts.

emmanuelg

WordPress gives us a lot of ways of classification: categories, tags, date … All of these methods are efficient, and cover most of our needs. But they are applied to all posts, and don’t allow differenciating or highlighting some specific posts. 
Sometime, it may be helpful to group items into folders or into series, in order to promote these posts, or simply because they belong to a logical sequence, such as tutorials with several stages.
The EG-Series plugin gives a set of easy and ergonomic functions to manage series of posts. This plugin allows to include posts into series, to create, delete or rename series. It also includes widgets and shortcodes to display list of series, or the list of posts belonging to the series of the current post.
EG-Series use only standard tools of WordPress, and doesn’t create additional tables or objects in WordPress. The version 2 of the plugin uses the taxonomies. The main advantages are:
<ul>
<li>The plugin was created in order to reduce as possible, manual operations, and reduce the number of errors,</li>
<li>EG-Series is fully customizable: users can choose the label of shortcodes, and slug used for series’ link,</li>
<li>It can be installed and configured very quickly. It also allows to modify a lot of posts without editing them.</li>
</ul>
With this plugin, you can:
<ul>
<li>Add / Delete a post from a serie,</li>
<li>Create / Rename / Delete series,</li>
<li>Display the list of series in a post, or display this list in sidebar, with widgets for exemple,</li>
<li>Display list of posts, using an another shortcode, or an another widget,</li>
<li>Automatically insert the list of posts of a specific serie, without using shortcode.</li>
</ul>
EG-Series is TinyMCE Integrated. That means you don’t need to learn the shortcode syntax. The plugin adds a button in the tinymce toolbar. You just have to click on this button, choose parameters/options, and click insert. That’s all, the shortcode will be insert into your post with the right parameters.
<h4>Contributions</h4>
Thanks to the following people for their help
<ul>
<li><a href="http://cedric.bosdonnat.free.fr/" rel="nofollow ugc">Cédric</a></li>
<li><a href="http://monkeyman.be/" rel="nofollow ugc">Jan Fabry</a></li>
</ul>
<h3>Customize your theme</h3>
EG-Series 2.x uses now a specific taxonomy to implement series. It means
<ul>
<li>The link to series can be: http://host/path/[slug]/[Name of the serie]</li>
<li>You can build / customize a specific page in your theme to display the content of a serie.</li>
</ul>
In the path <code>.../wp-content/plugins/eg-series/themes</code>, you will find some available customization for themes Twenty Ten, … 
To customize these themes, just copy the file <code>taxonomy-series.php</code> into the path of your theme <code>.../wp-content/themes/[Name of the theme]</code>.
You can also customize your theme, by modifying the <code>index.php</code> or <code>archive.php</code> file. For example:
name)); 
 ?>
<pre><code><div class="archive-meta"><?php
 echo htmlspecialchars(term_description( '', get_query_var( 'taxonomy' ) ));
?></div>
</code></pre>
To customize your theme templates, you have some templates tags available in the file <code>eg-series-template-tags.inc.php</code>

EG-Series

I've been using this very capable plug-in - almost a suite of plug-ins - for organizing and displaying posts in series for several years. I should have given it a positive review long ago.
The only reason I would hesitate to recommend it to others is that it has not been updated in two years. It also has some very minor functionality and language glitches and less than comprehensive documentation.
In addition, not being updated/supported means that some problems have crept in. After the WP Core upgrade to 4.2, the widgets stopped appearing: It turned out, however, that a fix was very simple (see Support Thread: https://wordpress.org/support/topic/has-the-latest-version-211-lost-its-widget?replies=5#post-8181189). 
So, you should be prepared to do some figuring out for yourself, although, once you do figure it out, you'll find that it works very well, it comes with rich options for alternative display and linking modes, and that the pieces are knit together quite well.



4 Stars not 5 only because no longer supported

EG-Series helps you to organize your posts in a new way, allowing the creation of groups (series) of posts. Can be useful to promote some posts.

Series Tag vs EG-Series