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.

Phi Phan

A simple, lightweight, accessibility-ready icon separator block.
<h3>Key Features</h3>
<ul>
<li>Customize the icon width, spacing, color and position.</li>
<li>Customize the separator width, style, color and position.</li>
<li>Accessibility ready with ‘separator’ role.</li>
<li>Simple and easy to use but included full settings even with responsive width and responsive vertical margin.</li>
<li>An icon library included icons from “Bootstrap Icons”, “Ionicons”, “Dashicons” and new “WordPress Icons”.</li>
</ul>
Please take a look at <a href="https://boldpatterns.net/keywords/separator?utm_source=wp.org&utm_campaign=readme&utm_medium=link&utm_content=Icon+Separator" rel="nofollow ugc">these custom block patterns</a> that use this block to see how it can be applied to real-world sites.
If this plugin is useful for you, please do a quick review and <a href="https://wordpress.org/support/plugin/icon-separator/reviews/#new-post" rel="ugc">rate it</a> on WordPress.org to help us spread the word. I would very much appreciate it.
Please check out my other plugins if you’re interested:
<ul>
<li><a href="https://wordpress.org/plugins/content-blocks-builder" rel="ugc">Content Blocks Builder</a> – This plugin turns the Block Editor into a powerful page builder by allowing you to create blocks, variations, and patterns directly in the Block Editor without needing a code editor.</li>
<li><a href="https://wordpress.org/plugins/display-a-meta-field-as-block" rel="ugc">Meta Field Block</a> – A block to display custom fields as blocks on the front end. It supports custom fields for posts, terms, users, and setting fields. It can also be used in the Query Loop block.</li>
<li><a href="https://wordpress.org/plugins/svg-block" rel="ugc">SVG Block</a> – A block to display SVG images as blocks. Useful for images, icons, dividers, and buttons. It allows you to upload SVG images and load them into the icon library.</li>
<li><a href="https://wordpress.org/plugins/breadcrumb-block" rel="ugc">Breadcrumb Block</a> – A simple breadcrumb trail block that supports JSON-LD structured data and is compatible with WooCommerce.</li>
<li><a href="https://wordpress.org/plugins/block-enhancements" rel="ugc">Block Enhancements</a> – Adds practical features to blocks like icons, box shadows, transforms, etc.</li>
<li><a href="https://wordpress.org/plugins/counting-number-block" rel="ugc">Counting Number Block</a> – A block to display numbers with a counting effect</li>
<li><a href="https://wordpress.org/plugins/better-youtube-embed-block" rel="ugc">Better YouTube Embed Block</a> – A block to solve the performance issue with embedded YouTube videos. It can also embed multiple videos and playlists.</li>
</ul>
The plugin is developed using @wordpress/create-block.

Icon Separator

A simple, lightweight, accessibility-ready icon separator block.

Separator Widget vs Icon Separator