Peter

<p>Stop a lot of spambots from polluting your site by making visitors identify a random word displayed as an image before commenting and optionally before registering. You can customize the pool of words to display.</p>
<h4>Features</h4>
<ul>
<li>
<p>Toggle whether registered users need to enter the word</p>
</li>
<li>
<p>Random font display</p>
</li>
<li>
<p>No cookies required</p>
</li>
<li>
<p>No JavaScript required</p>
</li>
<li>
<p>Auto-generated audio for visually impaired users</p>
</li>
<li>
<p>Easy-to-read</p>
</li>
<li>
<p>No mapping of words from the code — words are used once or removed after 24 hours</p>
</li>
<li>
<p>Reminder of what was entered if you get the word wrong</p>
</li>
<li>
<p>Selective blocking of trackbacks, pingbacks</p>
</li>
<li>
<p>Easy to translate</p>
</li>
<li>
<p>Compatible with caching plugins</p>
</li>
</ul>
<h4>Negatives</h4>
<ul>
<li>
<p>Purposely no obscuring techniques so that the anti-spam word is easy to read</p>
</li>
<li>
<p>The more people who use this plugin, the more motivation for spambots to target it</p>
</li>
</ul>
<h4>Requirements</h4>
<ul>
<li>
<p>GD Library and FreeType Library (There’s a diagnostic page to tell you whether you have them installed. If needed, just ask your web host to install them!)</p>
</li>
<li>
<p>WordPress 3.2 or higher</p>
</li>
</ul>
<h4>Translations</h4>
<ul>
<li>ru_RU translation by koc</li>
<li>sk_SK translation by Patrik Žec (PATWIST) of http://patwist.com</li>
</ul>


Peter’s Custom Anti-Spam

Stop a lot of spambots from polluting your site by making visitors identify a custom word displayed as an image before commenting.

algorhythm

<p>This Plugin integrates the Google reCAPTCHA Service Modul in the BuddyPress Template Page ‘register.php’. The file is located in ‘/wp-content/themes/{name}/registration/register.php’. The plugin adds the new feature by adding an action on ‘bp_before_registration_submit_buttons’. Therefore the ‘register.php’ must contain the line ‘do_action( ‘bp_before_registration_submit_buttons’ )’. My one was generated with the famous plugin <a href="https://wordpress.org/extend/plugins/bp-template-pack/" rel="ugc">BuddyPress Template Pack</a>. It makes a normal WordPress-Template ready for use with <a href="https://wordpress.org/extend/plugins/buddypress/" rel="ugc">BuddyPress</a>. The missing files in the template will be added.</p>
<h4>Some Features</h4>
<ul>
<li>not yet, the plugin has no admin-page, but it will follow</li>
<li>at the beginning of the ‘bp-recaptcha.php’ are some variables to add/change the <a href="https://www.google.com/recaptcha/admin/create" rel="nofollow ugc">reCAPTCHA Api keys</a>, style of reCAPTCHA, language and texts</li>
</ul>
<h4>Languages</h4>
<ul>
<li>English, but can be switched very simple</li>
</ul>
<p>Notice: The installation of this plugin will require additional work. Edit the ‘bp-recaptcha.php’ file to make your settings.</p>


BuddyPress reCAPTCHA

I found this plugin amazing so I forked it to create an easy to use admin panel: https://wordpress.org/plugins/buddypress-captcha/
Thanks!



AMAZING!! I forked it

This plugin utilizes reCAPTCHA to help your blog stay clear of spam-registrations.

Peter’s Custom Anti-Spam vs BuddyPress reCAPTCHA