Blue Captcha

Blue Captcha is a top-shelf solution for the WordPress platform when it comes to image&text CAPTCHAs.

It's main role is to protect the site from automated bots that might try and spam or hack the site.

Installation:

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

Features:

• Supports 5 different fonts
• Supports 30 different backgrounds
• Show up to 20 characters in the CAPTCHA
• 7 predefined CAPTCHA difficulty levels
• Show extra drawings besides the letters to increase difficulty
• Can be shown to logged-in and/or unregistered users alike
• Lots of customization options via the WP backend settings page
• Logs CAPTCHA usage activity
• Export the log to CSV
• Provides blocking options as well

What is new in this release:

• New option "Enable Translation" was added in General Options.

What is new in version 1.7.1:

• Translation to Spanish.

What is new in version 1.7:

• New option "Captcha Position On Comment Form" was added in General Options (Beta)
• New option "Refresh Type" was added in General Options (default text "Refresh" or icon can be used for refreshing captcha)
• Opportunity of selecting a particular color & background for all captcha types
• Template translation file ("blue-captcha.pot") was created and located in "languages" folder

What is new in version 1.6:

• New options were added for "Make Empty Captcha Check Before Form Submission" in General Options
• "Save Incorrect Passwords Only" option was added for "Save Passwords" in General Options
• Issue with saving blocked IPs was fixed (for PHP versions prior to 5.2.9)
• IPs are grouped in Hall Of Shame
• "View Log" link was added for every IP address in Hall Of Shame

Requirements:

• WordPress 2.8.6 or higher