ShinichiN

This plugin enables you to create unlimited custom sidebar/widget areas and switch existing areas. You can do this without touching your theme.
This plugin utilizes term meta api and so it works only with WordPress 4.4 and above.
Your theme needs to use <code>is_active_sidebar()</code> when calling <code>dynamic_sidebar()</code> function.
This will work.
<pre><code>if ( is_active_sidebar( 'sidebar-1' ) ) {
 dynamic_sidebar( 'sidebar-1' );
}
</code></pre>
This doesn’t work.
<pre><code>dynamic_sidebar( 'sidebar-1' );
</code></pre>
If you only want to output your custom sidebar, put this code on where you want to display the sidebar in your theme.
<pre><code>do_action( 'dynamically_dynamic_sidebar' );
</code></pre>
<a href="https://github.com/ShinichiNishikawa/Dynamically-Dynamic-Sidebar/" rel="nofollow ugc">This Plugin published on GitHub.</a>
ウィジェットエリアをいくつでも定義し、カテゴリやタグ、カスタム分類ごとに差し替えたり、投稿・ページ・カスタム投稿から使いたいサイドバーを指定したりすることができます。「スクリーンショット」のタブをごらんいただくと、イメージが湧きやすいと思います。

Dynamically Dynamic Sidebar

Create unlimited custom sidebar/widget areas and switch existing areas depending on post, page, custom-post-type post, categories, tags and custom tax …

enomoto celtislab

You can easily insert before and after the articles, advertising and social button, and boilerplate.
Add 6 widget areas.
<ul>
<li>Start position of the page</li>
<li>Before the single post content </li>
<li>Articles in short code or more tag position </li>
<li>After the single post content </li>
<li>End position of the page </li>
<li>wp_head position (In the HTML <head> element)</li>
</ul>
Add Post6 text widget
<ul>
<li>It is a function up version of the text widget.</li>
<li>You can specify the lifetime and post ID, category of interest.</li>
</ul>
These features, making it easy to use for displaying an advertising and social button, and boilerplate.
<a href="http://celtislab.net/wp_plugin_post6widgetarea/" title="Documentation in Japanese" rel="nofollow ugc">日本語の説明</a>

Post6WidgetArea

Add the widget area of 6 locations around the post article, etc..

Dynamically Dynamic Sidebar vs Post6WidgetArea