This Widget lists the sub-categories for a given category.

clinton4

List Sub Categories (LSC)

This plugin enables a widget that lists only sub categories for the current category page.

Muntasir Rahman

Woo Subcategory Thumb

Display sub categories as a thumb in parent category page

nasznjoka

Category Family Tree

Show Category ancestors and sub categories on the sidebar

drmen8x

VNEcategory

Show category and subcategory and post in these categories

Sometimes when you divide up your WordPress content into categories it all ends up in sub-categories of one or two main categories that don’t have any content themselves.
With the widget you can add a list of sub-categories even if the parent doesn’t have posts.
You can display and filter sub-categories in various ways:
<ul>
<li>Use the parent category as the widget title</li>
<li>Show post counts in bracket next to the name</li>
<li>Hide empty sub-categories</li>
<li>Add a link to the parent category to the widget title</li>
<li>Show the full sub-category tree so it include sub-sub categories and so on as well</li>
<li>Display the list as dropdown rather than as links</li>
<li>Use the first category of the current post as the parent</li>
<li>Exclude one or more sub-categories from the list</li>
<li>List the categories in reverse order</li>
</ul>

Alternatives to Sub Categories Widget

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