Please post your opinions about these CAPTchas to use during distribution.

If you have solid reasons to not even consider one option, expose it here.

Feel free to propose any new candidates.

After some feedback is gathered, I'll start a poll.

• Google's reCaptcha
• SweetCaptcha
• Confident
• PHPcaptcha
• Asirra
• Captchas.net
• iCaptcha
• NUCaptcha