webjema

<p>Adds CAPTCHA anti-spam methods to WordPress on the comment form, registration form, or both.<br />
In order to post comments, users will have to range icons in right (upright) place.<br />
This can help prevent spam from automated bots (100%). This will also increase the quantity of comments because of funny icons.</p>
<p>Requirements/Restrictions:</p>
<ul>
<li>Works with WordPress 2.x, 3.x.</li>
<li>PHP 4.3.0 or above with GD2 library support.</li>
<li>Your theme must have a <code><?php do_action('comment_form', $post->ID); ?></code> tag inside your comments.php form. Most themes do.<br />
The best place to locate the tag is before the comment textarea, you may want to move it if it is below the comment textarea.</li>
</ul>
<p>Features:</p>
<ul>
<li>Configure from Admin panel</li>
<li>JavaScript is not required (but desirable)</li>
<li>Allows Trackbacks and Pingbacks</li>
<li>Setting to hide the CAPTCHA from logged in users and or admins</li>
<li>Setting to show the CAPTCHA on the comment form, registration form, or both</li>
<li>I18n language translation support (see FAQ)</li>
</ul>
<h3>Configuration</h3>
<p>After the plugin is activated, you can configure it by selecting the <code>NotCaptcha options</code> tab on the <code>Admin Plugins</code> page.<br />
Here is a list of the options:</p>
<ol>
<li>
<p>NotCaptcha on Register Form: – Enable captcha on the register form.</p>
</li>
<li>
<p>NotCaptcha on Comment Form:  – Enable captcha on the comment form.</p>
</li>
<li>
<p>NotCaptcha on Comment Form:  – Hide captcha for registered users (select permission level)</p>
</li>
<li>
<p>Noise on captcha:  – Add some shapes to protect the image from auto-recognition</p>
</li>
<li>
<p>Background color of images: – Set color similar to your blog background</p>
</li>
</ol>
<h3>Usage</h3>
<p>Once activated, a captcha section is added to the comment and register forms.</p>
<h3>Version History</h3>
<p>rel 1.3.1 (30 October 2011)</p>
<ul>
<li>Added function “imagerotateEquivalent” (works if your php installation do not has “imagerotate” function)</li>
<li>Gallery folder disabled from listing</li>
<li>Added new noise to images</li>
<li>Added new icons to gallery </li>
<li>Added Spanish language</li>
</ul>
<p>rel 1.3 (27 June 2011)</p>
<ul>
<li>Added mobile devices support (rotate by clicking on image)</li>
<li>Code optimization (no captcha form – no css and js in page header)</li>
<li>Added new icons to gallery</li>
</ul>
<p>rel 1.2 (3 May 2010)</p>
<ul>
<li>The method to check the correct answer has changed</li>
<li>Corrected problem if blog installed in subfolder</li>
<li>Added “Reload images” button</li>
<li>CSS problems corrected</li>
<li>Added “noise” option</li>
<li>Added “background color” option</li>
<li>Added new icons to gallery</li>
<li>A lot of small corrections</li>
</ul>
<p>rel 1.1 (3 Jul 2009)</p>
<ul>
<li>Initial Release</li>
</ul>


WP-NOTCAPTCHA

New kind of human test. Adds CAPTCHA anti-spam method to WordPress on the comment form, registration form, or both.

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.

WP-NOTCAPTCHA vs Peter’s Custom Anti-Spam