This plugin doesn't seem to be maintained anymore though I could get it working. In order to initially set it up, I used the URL https://www.google.com/recaptcha/ rather than the one to which it directed me [it was broken]. Then, I clicked Get reCAPTCHA. You'll need to login and there you can access the site key (public) and secret key (private).
Lastly, the label formatting in IE looked terrible so I commented it out of the php code.
$html .= '<label>CAPTCHA code</label>';
Once it started working though, it was very helpful. The only similar plugins I found were paid.
Very simple and functional, but can be a little hard for beginners since the API key is not inserted on frontend. Thanks for share.
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