For those who have decided to protect their website and / or online services by using Captcha, these are just some of the sources where you can get your free Captcha plugin / script.
If you are not sure which of the following suits your needs or technical knowledge, check this list of considerations regarding Captcha implementation.
In any case, implementing Captcha should be easy.

10 Resources for Free Captcha

1. Free Captcha by reCAPTCHA – You must sign up to the site in order to use their free captchas.

2. An open-source free PHP CAPTCHA script by Securimage

3. Free Captcha images by captchas.net.

4. Free ASP security image generator software by Web Wiz Guide.

5. Free PHP Captcha scripts by thefreecountry.com.

6. Free Captcha by Protect Web Form.

7. A free Captcha generator by Captchator.

8. Free captcha script by Andyydev.com.

9. Captcher (=a PHP script that generates and verifies captchas) by White Hat Crew.

10. VidoopCAPTCHA – a free image Captcha by Vidoop (read more about it on our post: Image based Captcha).

For other security solutions that work like Captcha, feel free to read this comprehensive post by Netwaver:
34 Free Captcha Script and Anti Spam Services.

Got some free Captcha resource to recommend on?
Write it down on the comments section below…