mtrdesign

This plugin represents a RSS feed separator, which enables your readers to create RSS subscriptions that only contain posts with specific tags. 
For example, visitor A could create and subscribe to an RSS feed including the tags cooking, recipes, and fine living. Visitor B, could 
instead prefer to read posts related to the tags cocktails, wine, and night life. Each person will have it’s own RSS Feed URL, and each of 
those feeds will only include posts that have one or more of the preselected tags.
If you have a busy blog with lots of entries in it, you should definitely consider installing Selected Tags RSS, in order to enable your visitors 
to subscribe just to the topics they are interested in.
You can configure the location where the the RSS selector would be showing from the plugin settings. If your theme supports widgets you can add and configure a widget from Appearance > Widgets > Selected Tags RSS.
The plugin supports shortcodes. Use <code>[selected-tags-rss-post title="***"]</code> shortcode to show RSS link in posts and <code>[selected-tags-rss-search title="***"]</code> to show the RSS Selector. Title parameter is the optional name of link.
<a href="http://mtr-design.com/" rel="nofollow ugc">Plugin homepage</a>
Features:
<ul>
<li>A different Feed URL for each combination of tags</li>
<li>Simple administration interface</li>
</ul>
Take the time to read the user guide.
<h3>Usage</h3>
<h4>Adding the RSS Selector to the WordPress Sidebar</h4>
<ol>
<li>The plugin provides a widget called “Selected Tags RSS”. You can add this widget to your sidebar or other widget zone via Appearance > Widgets.</li>
</ol>
<h4>Adding the RSS Selector to a WordPress Page</h4>
<ol>
<li>Click on the “Selected Tags RSS” link in the WordPress administration menu to access the plugin settings.</li>
<li>Use the “Selected Pages” widget to Activate the RSS Selector for the desired pages by moving them from the left list to the right one.</li>
<li>Another option is to edit the page and use the shortcode following shortcode (title is optional): <code>[selected-tags-rss-search title="Generate RSS feed with these tags"]</code></li>
</ol>
<h4>Adding the RSS Link to WordPress Posts</h4>
<ol>
<li>The plugin provides a global setting called “Show RSS Link in Posts”, which is found at the “Selected Tags RSS” settings page in the WordPress administration menu. Enabling this setting will result in a special link being added to all Posts </li>
<li>Another option is to use the following shortcode in your Post (title is optional): <code>[selected-tags-rss-post title="Generate RSS feed with these tags"]</code></li>
<li>Yet another option is to edit your Posts template and call the function get_selected_tags_RSS(), as in: <code><?php echo get_selected_tags_RSS() ?></code>. </li>
<li>The automatically generated RSS Link text can be edited vie the plugin settings.</li>
</ol>

Selected Tags RSS

Enable separate RSS feeds covering different combinations of tags. Each feed will only list entries that match at least one of the feed's tags.

BjornW

Add tags to a Page just as you would do with a Post.
This plugin adds the ‘post_tag’ taxonomy to the Page post type. 
This enables the tags metabox in the New or Edit Page interface. To show tagged 
Pages on a tags archive page or in a feed, it uses the ‘pre_get_posts’ hook 
to change the post_type query parameter to ‘any’.
The plugin has no settings, does not alter the database and only uses hooks to 
achieve it’s goal. It also should work perfectly fine with Multisite installations.
If this plugin meets your expectations and you use it commercially 
please consider a donation to one of these organisations or your country’s equivalents:
<ul>
<li><a href='https://www.msf.org/' rel="nofollow ugc">Medicines Sans Frontiers</a> </li>
<li><a href='https://fsfe.org' rel="nofollow ugc">Free Software Foundation Europe</a></li>
<li><a href='https://https://www.bitsoffreedom.nl/english/' rel="nofollow ugc">Bits of Freedom</a></li>
<li><a href='https://edri.org/' rel="nofollow ugc">European Digital Rights (EDRi)</a> </li>
<li><a href='https://fsf.org' rel="nofollow ugc">Free Software Foundation</a></li>
<li><a href='https://eff.org' rel="nofollow ugc">Electronic Frontier Foundation</a></li>
</ul>
<h3>Notes</h3>
Credits:
Tag icon used in the WordPress plugin repository and found in /assets/icon* 
From the series <a href="http://www.toicon.com/series/flat-shadows" rel="nofollow ugc">‘Flat Shadows’</a> By <a href="http://www.toicon.com/authors/1" rel="nofollow ugc">Shannon E Thomas</a>
Thanks Shannon E Thomas and to[icon] for sharing your work!
WordPress repository header image found in /assets: 
<a href="http://www.flickr.com/photos/sdasmarchives/7467520412/" rel="nofollow ugc">‘Crew Baggage Tag’</a>
From the Leslie Grimes Moser Photo set. Moser was a flight attendant for Capitol Airlines. 
Repository: San Diego Air and Space Museum Archive
Thanks San Diego Air and Space Museum Archive & Flickr Commons – flickr.com/commons

Tag Pages

Add tags to Pages, just as you would do with Posts

Selected Tags RSS vs Tag Pages