dancoded

Display categories as a list of links or a dropdown jump-menu (automatically navigate to page when selected).
Includes advanced options to change the taxonomy, display post counts and the category hierarchy, change how they are ordered, add CSS styles and modify the title.
Replaces the built in Categories Widget (WP_Widget_Categories).
A hook is available to filter the title: <code>dmg_categories_widget_title</code>.
For example, to change the title on a single page or post, you could add this to your functions.php file:
<pre><code>function myTitleFilter( $title ) { if( is_singular() ) { return "$title"; } else { return $title; 
 } } add_filter( 'dmg_categories_widget_title' , 'myTitleFilter'); </code></pre>
More information about this plugin can be found at <a href="http://dancoded.com/wordpress-plugins/categories-widget/" rel="nofollow ugc">http://dancoded.com/wordpress-plugins/categories-widget/</a>.

DMG Categories Widget

Displays categories as a list or dropdown jump-menu. With advanced options to add CSS classes and modify the title .

iteamweb

Display Categories Widget will display Child categories on your sidebar. Can be placed on widget in sidebar.
Development
Our development is being tracked on <a href="https://github.com/iteamweb/Display-Categories-Widget" rel="nofollow ugc">GitHub URL</a>. Please fork, code, raise pull request, suggest improvements on GitHub.
Features 
1. Limit number of categories that appears.
<ol>
<li>
Exclude categories from display.
</li>
<li>
Restrict levels of categories that can be shown.
</li>
<li>
Display categories as list or dropdown.
</li>
<li>
Hide categories that does not have any posts.
</li>
<li>
Display/Hide number of posts available in categories.
</li>
<li>
Display/Hide category description on hover in title attribute
</li>
</ol>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/hFwz-yDu710?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 allow-popups-to-escape-sandbox"></iframe>
<h3>Support</h3>
<h4>How to contact plugin support?</h4>
We support through https://wordpress.org/support/plugin/display-categories-widget and http://www.iteamweb.com/open-source-softwares/wordpress/wordpress-plugins/display-categories-widget/
<h3>Arbitrary section 1</h3>

Display Categories Widget

Display Categories Widget will display Child categories on your sidebar. Can be placed on widget in sidebar.

DMG Categories Widget vs Display Categories Widget