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.

<p>yaCAPTCHA is a CAPTCHA plugin for WordPress that helps you block comment spam<br />
from automated bots. In order to post comments, users will have to write down<br />
the characters that are part of an image. Since it is relatively hard for<br />
automated programs to figure out those characters, this will help prevent<br />
comment spam from those programs.</p>
<h4>Requirements</h4>
<ul>
<li>WordPress 1.5 or higher.</li>
<li>PHP 4.1.0 or higher with GD2 library support.</li>
<li>Theme must support the ‘comment_form’ action.</li>
<li>PHP sessions enabled and properly configured.</li>
</ul>
<p>In case you are wondering, most hosting providers should have those basic<br />
requirements in place.</p>
<h4>Strengths vs other solutions</h4>
<ul>
<li>Easy to install</li>
<li>Does not require Javascript to work</li>
<li>Broad WordPress version support</li>
</ul>
<h3>Thanks</h3>
<p>Thanks to Kruglov Sergei for creating KCAPTCHA, his pretty good CAPTCHA. You<br />
can visit KCAPTCHA website <a href="http://www.captcha.ru/en/kcaptcha/" title="KCAPTCHA
website">here</a>.</p>


yaCAPTCHA

yaCAPTCHA is a CAPTCHA plugin for WordPress that helps you block comment spam from automated bots.

WP-NOTCAPTCHA vs yaCAPTCHA