Peter Booker

(note: Gutenberg Editor Required)
A syntax / code highlighter Gutenberg block. Paste your code into the block, set the language and see your code highlighted exactly like it will display on the frontend.
<h4>Features</h4>
<ul>
<li>Syntax highlighting block for the Gutenberg Editor</li>
<li>Switch between editor and preview, see exactly what will appear on the frontend.</li>
<li>Supports 121 languages, listed <a href="https://codemirror.net/mode/" rel="nofollow ugc">here</a>.</li>
<li>2 Themes, VSCode Dark+ and Github, see the screenshots below. (more coming soon)</li>
<li>Static HTML output, no frontend scripts or user tracking.</li>
</ul>

Kebo Code

Lightweight syntax / code highlighter which outputs plain HTML, no bloat or JavaScript.

Amit Gupta

iG:Syntax Hiliter allows you to post source code to your site with syntax highlighting and formatting (as seen in code editors, IDEs). You can paste the code as is from your code editor or IDE and this plugin will take care of all the code colouring and preserve your formatting. It uses the <a href="http://qbnz.com/highlighter/" rel="nofollow ugc">GeSHi library</a> to colourize your code and supports over a 100 programming languages. Most common languages are included with the plugin and it includes drop in support for more languages used by GeSHi.
NOTE : For fast results and less load on your server, you should have a cache plugin installed. That way the plugin won’t have to parse the code blocks on a post every time its loaded in browser.
<h4>Minimum Requirements</h4>
<ul>
<li>WordPress 4.1 or above</li>
<li>PHP 7.4.0 or above</li>
</ul>
Pull requests are welcome on Github.
Github: <a href="https://github.com/coolamit/ig-syntax-hiliter/" rel="nofollow ugc">https://github.com/coolamit/ig-syntax-hiliter/</a> 
<a href="https://github.com/coolamit/ig-syntax-hiliter/blob/master/README.md" rel="nofollow ugc">Documentation on plugin usage and configuration</a>

iG:Syntax Hiliter

A plugin to easily present source code on your site with syntax highlighting and formatting  (as seen in code editors, IDEs).

Kebo Code vs iG:Syntax Hiliter