reCAPTCHA II
Implements reCAPTCHA support. A better CAPTCHA than the default.
Implements reCAPTCHA support and overrides the default MyBB CAPTCHA with reCAPTCHA. If the PHP GD extension is not available but this plugin is installed and activated and CAPTCHA support is enabled, reCAPTCHA will appear. The GD extension is not always available (especially on Windows servers).This plugin displays reCAPTCHA during user registration and on forums where guests are allow to post new posts and threads.
Automatically maps the user's language to the reCAPTCHA multilingual support system with English fallback.
Works and is fully tested under Firefox, Internet Explorer 6+, and Opera.