Kamal Hosen

WP Code Snippet is an easy, clean and simple way to share code in your website. WP Code Snippet support Gutenburg and classic editor. 
I develop a Gutenburg block Snippet.

WP Code Snippet

The plugin for share code snippets in page, post or anywhere in your website

Luigi Cavalieri

Cipher is a settings-free plugin that allows commenters to publish (pre-formatted) code.
Functionalities:
<ul>
<li>Backticks (`) can be used as an alternative to the <code><code></code> tag to mark up both in-line and pre-formatted code within a comment.</li>
<li>Formatted chunks of code or pieces of code longer than 70 characters posted via the comment form automatically wrapped in <code>pre+code</code> tags.</li>
<li>Special characters in code submitted through the comment form automatically converted to HTML entities.</li>
</ul>

Cipher

Cipher allows commenters to publish (pre-formatted) code.

WP Code Snippet vs Cipher