Comment form CAPTCHA using Really Simple CAPTCHA plugin. Proof-of-concept for other plugin developers.
This plugin adds a CAPTCHA field to your comment form, using the API provided by the Really Simple CAPTCHA Plugin to provide the CAPTCHA image and validation. The Plugin adds a CAPTCHA field to the comment-reply form, and uses AJAX to provide user feedback regarding correct/incorrect CAPTCHA entry. If the user submits the comment with an incorrect CAPTCHA, the comment is automatically marked as "spam".
This Plugin requires the Really Simple CAPTCHA Plugin to be installed in order to function.
This plugin is fully functional, but is mostly intended to be a "proof of concept" for other plugin developers who may want to use the Really Simple CAPTCHA plugin's API to provide CAPTCHA functionality for their own plugins.