Flector

The plugin allows you to manage the values of the “rel” attribute in comment links. You can enable or disable the "ugc" and "nofollow" values for all links in comments (separately for the comment author’s links and separately for links within the comment).
Help from Google:
rel="ugc": UGC stands for User Generated Content, and the ugc attribute value is recommended for links within user generated content, such as comments and forum posts.
rel="nofollow": Use this attribute for cases where you want to link to a page but don’t want to imply any type of endorsement, including passing along ranking credit to another page.
You can read more in the Google <a href="https://webmasters.googleblog.com/2019/09/evolving-nofollow-new-ways-to-identify.html" rel="nofollow ugc">blog</a>.
The plugin’s additional features include the ability to hide comment links from Yandex (by inverting them with <!––noindex––><!––/noindex––> tags).
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UGC Comments

cool :)

The plugin allows you to manage the values of the "rel" attribute in comment links ("ugc", "nofollow").

ugcplugin

UGC Creator is a powerful and easy-to-use WordPress plugin that empowers your users to submit posts from the frontend of your website.
UGC Creator offers a front-end form allowing visitors to submit posts and upload images with ease. Simply insert the following shortcode into any Post or Page:
<pre><code>[ugc_plugin]
</code></pre>
Our plugin is built with the highly versatile and user-friendly <a href="https://editorjs.io/" rel="nofollow ugc">Editor.js</a>, providing your users with an array of formatting and styling options to create stunning, professional-grade posts. UGC Creator supports a range of content types, including text, images, and videos, making it the perfect tool for any website that relies on user-generated content.

UGC Creator

Plugin for User-Generated Content: Get frontend post with an array of formatting and styling options to create stunning, professional-grade posts.

UGC Comments vs UGC Creator