Really Simple CAPTCHA is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin. Really Simple CAPTCHA does not work alone and is intended to work with other plugins. It is originally created for Contact Form 7, however, you can use it with your own plugin.

WP Requirements:
3.7 or higher, up to 3.8.1

To install:
1. Upload the folder to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress