NavThemes

Spammers want to have a backlink from your site and the quick way to have is to comment on your posts and for site owner removing these spam comments are hectic. this plugin simply remove website url field so spammers are less likely to attack your site.

Remove Website Url From Comment Form

Spammers want to have a backlink from your site and the quick way to have is to comment on your posts and for site owner removing these spam comments  …

Silkalns

WP Chill

Cristian Raiber

A very useful plugin for everyone using WordPress. Adds reCaptcha security to the WordPress login form, register form and comment form. This plugin could help your blog get rid of a lot of spam comments or brute-force attacks.
Nothing gets passed it if the reCaptcha doesn’t validate.
A few notes about the plugin:
<ul>
<li>Supports audio or image captcha types</li>
<li>Can generate the reCaptcha image / audio type in a number of predefined languages</li>
<li>Adds reCaptcha protection to the WordPress login form</li>
<li>Adds reCaptcha protection to the WordPress register form</li>
<li>Adds reCaptcha protection to the WordPress comment form</li>
<li>Adds reCaptcha protection to the WordPress recover password form</li>
</ul>

Uber reCaptcha

This plugin adds the reCaptcha form to the WordPress login form, recover password form, register form and comment form.

Remove Website Url From Comment Form vs Uber reCaptcha