erez_lieberman

This very simple plugin Hides the top three fields (author, email, and website) in comment form and after you will click on the big comment field this three fields will be open smoothly.
After you upload and activate the plugin the comments forms on your site will look like this: 
 <iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/SIZOk0WA3sE?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
in the <a href="https://wordpress.org/plugins/wp-toggle-comments-form-fields/screenshots/" rel="ugc">screenshoot section</a> you can look on the first screenshot – it’s a litlle animated gif that illustrates the effect. 
You can see a live preview of this plugin in <a href="http://www.studio-hitchadshut.co.il/%D7%AA%D7%95%D7%A1%D7%A3-%D7%97%D7%93%D7%A9-%D7%A9%D7%A4%D7%99%D7%AA%D7%97%D7%AA%D7%99-%D7%9C%D7%90%D7%AA%D7%A8%D7%99-%D7%95%D7%95%D7%A8%D7%93%D7%A4%D7%A8%D7%A1-wp-toggle-comments-form/" rel="nofollow ugc">my site</a>, this is a blog post(in hebrew) about my plugin, in the comments form(bottom of page) of this post you can see how its look like with this plugin.
<h4>Languages</h4>
<ol>
<li>English</li>
<li>Hebrew</li>
</ol>

WP Toggle Comments Form

Toggle The Comments Form Fields On Wordpress Posts And Pages

Dimox

Plugin replaces comment author link and (or) links in comment text on jQuery links that will work (i.e. it will be possible to go on the specified site through these links) only in case when the JavaScript technology is enabled in a browser of the visitor of your site.
When can this plugin might be useful:
<ul>
<li>If you want to reduce the number of external links on your site (for example, for any SEO reasons).</li>
<li>If you don’t want to refer to bad sites and you don’t have time and desire to check the links, which are left by the authors of comments.</li>
</ul>
Here is how it looks. For example, there is such a link on the name of comment author:
<pre><code><a href='http://sitename.com' rel='external nofollow' class='url'>Comment Author Name</a>
</code></pre>
After plugin activation this link will turn to the such:
<pre><code><a href="#" class="jqcl" title="sitename.com" rel="nofollow">Comment Author Name</a>
</code></pre>
This is jQuery link, that will work only if JavaScript technology is enabled in a browser of the visitor of your site.
Links to your site will not be replaced.

jQuery Comment Links

Plugin replaces comment author link and (or) links in comment text on jQuery links.

WP Toggle Comments Form vs jQuery Comment Links