Logical Captcha takes advantage of the TextCaptcha.com service, which provides logic-based textual questions instead of distorted images or audio to validate that the entity registering is a real live human being, and not a spam bot. It will provide protection against false registrations and the dreaded spam comments, etc.
An example of such a question might be:
Question: 
Out of a truck, a lion, the color purple, and the number forty-two, which has a door?
Answer: 
truck
Textual logic-based captchas mean that your registration process will be accessible to everyone, including visually/hearing impaired visitors who use access technology to surf the web. It requires a free API key from <a href="http://TextCaptcha.com" rel="nofollow ugc">TextCaptcha.com</a>
This plugin was developed by Josh de Lioncourt of <a href="http://maccessibility.net" rel="nofollow ugc">the Mac-cessibility Network</a>, a site dedicated to blind and visually impaired users of the Mac OS X operating system, the iPhone OS, and other Apple Inc. products and services. Josh de Lioncourt, the Mac-cessibility Network, and related sites are not in anyway affiliated with TextCaptcha.com

Logical Captcha

Integrates a logic captcha to verify that the registrant is a human and not a spam bot instead of using distorted images or audio.

Ajay Singh

My Custom Login is the WordPress login plugin, allows site admin to add login/registration on their sites menu. 
It uses the page wp-login.php for login and wp-signup.php for register, it displays the login/register link if you are logged out and logout link if you are logged in.
<h4>Features</h4>
<ul>
<li>Your registration, log in, pages remains same no changes.</li>
<li>Simple login registration links that allow users to login and register to your site.</li>
</ul>

My Custom Login

My Custom Login is the WordPress login plugin, allows site admin to add login/registration on their sites menu.

Logical Captcha vs My Custom Login