Daniel Ostman

Separator Widget inserts a horizontal rule ( <code><hr></code> ) or a custom div ( <code><div class="my-separator"></div></code> ) in your widget area. Each widget can be set to one of those options.
No extra styling is added so you are free to style them however you want it. 
Add your custom <code>hr</code> styling to your CSS or use <code>.my-separator</code> if you prefer that option.
Free and easy to use!
<a href="http://www.danielostman.se/" title="Visit WordPress developer web site" rel="nofollow ugc">More info about the WordPress plugin developer</a>

Separator Widget

A widget that inserts a horizontal rule or a custom div.

Ciprian

Note: The plugin has been adopted and is under development. A lighter version is now available and more releases will be pushed in the near future. Stay tuned and report bugs or code inconsistencies.
*Note:** A new version is coming with fully compatible editor blocks, design patterns, a reusable block library and a UI kit.
A Modern Design Library toolkit for creating separators, lines, dividers, decorative elements and more.
The library currently includes a colored line block.
Read more on <a href="https://getbutterfly.com/wordpress-plugins/modern-design-library-ui/" rel="nofollow ugc">getButterfly</a>.

Modern Design Library

A Modern Design Library toolkit for creating separators, lines, dividers, decorative elements and more.

Separator Widget vs Modern Design Library