Louis

This WordPress Plugin prevents the browser from caching your main stylesheet during development. This comes in handy when you have clients and others viewing your work and you don’t want to explain to them that they need to clear their browser’s cache all the time.
Major features in WP Enable WebP include:
<ul>
<li>No Setup Required</li>
<li>Doesn’t touch the database</li>
</ul>

WP Prevent CSS Cache

License: GPLv2 or later WordPress plugin to prevent caching your stylesheet during development

ctomczyk

Spam Prevention for WP Contact Form 7 and WordPress Comments. 
This plugin adds a small code snippet to determine page scroll and add dynamically a unique token. 
It also supports the “Contact Form 7 Database Addon – CFDB7” and prevents contact form submissions from being saved if validation fails.
If the token doesn’t exists while submitting or call directly API then the incoming request will be rejected.
You can see how it works on <a href="https://www.sitelint.com/contact" rel="nofollow ugc">SiteLint</a> website.

Spam Prevention for Contact Form 7 and Comments

Spam Prevention for WP Contact Form 7 (manage multiple contact forms) and WordPress Comments.

WP Prevent CSS Cache vs Spam Prevention for Contact Form 7 and Comments