PlusCaptcha

To solve a PlusCaptcha plugin CAPTCHA, the user must rotate the circle at the center of the CAPTCHA image and reconstruct the photo to its original state.

This implies a complex mouse interaction, which most spam bots won't be able to detect and perform.

This easily separates humans from bots, protecting the site against spam messages and brute force attacks.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

Features:

• Cross-browser tested
• Easy setup process
• Mobile friendly
• Customize CAPTCHA size
• Customize CAPTCHA difficulty
• Customize CAPTCHA color
• Use it on login forms
• Use it on lost password forms
• Use it on comment forms
• Use it with custom contact forms

What is new in this release:

• Padding footer fixed.
• Padding form fixed.

What is new in version 1.2.1:

• Hides link by default.

Requirements:

• WordPress 3 or higher