Peter

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.
<h4>Features</h4>
<ul>
<li>
Toggle whether registered users need to enter the word
</li>
<li>
Random font display
</li>
<li>
No cookies required
</li>
<li>
No JavaScript required
</li>
<li>
Auto-generated audio for visually impaired users
</li>
<li>
Easy-to-read
</li>
<li>
No mapping of words from the code — words are used once or removed after 24 hours
</li>
<li>
Reminder of what was entered if you get the word wrong
</li>
<li>
Selective blocking of trackbacks, pingbacks
</li>
<li>
Easy to translate
</li>
<li>
Compatible with caching plugins
</li>
</ul>
<h4>Negatives</h4>
<ul>
<li>
Purposely no obscuring techniques so that the anti-spam word is easy to read
</li>
<li>
The more people who use this plugin, the more motivation for spambots to target it
</li>
</ul>
<h4>Requirements</h4>
<ul>
<li>
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!)
</li>
<li>
WordPress 3.2 or higher
</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.

Mike

The whole idea to this plugin is to keep spammer robots from posting on your blog, reducing the space taken by spam messages in the database, and preventing your blog from being a spam magnet.
You can ask anything, keep it simple and obvious, e.g. Is the sky Green? NO!. Doing this will stop stupid bots from being able to post.
It only shows up when you are logged out, so you dont have to fill it in if your an admin. On top of this, it also adds javascript validation to the form to ensure the required fields are filled in.
You can configure the plugin in <code>Admin > Tools > Spam Stopper</code> after installing it.

spam-stopper

The whole idea to this plugin is to keep spammer robots from posting on your blog, reducing the space taken by spam messages in the database, and prev …

Peter’s Custom Anti-Spam vs spam-stopper