1. Anti-spam
Anti-spam
2. Confident CAPTCHA
Confident CAPTCHA
3. FunCaptcha – Game CAPTCHA
FunCaptcha – Game CAPTCHA
4. CleanTalk – Spam Protection
CleanTalk – Spam Protection
5. Solve Media CAPTCHA
Solve Media CAPTCHA
6. AVH First Defense Against Spam
AVH First Defense Against Spam
7. KeyCAPTCHA – Social WordPress CAPTCHA
KeyCAPTCHA – Social WordPress CAPTCHA
8. Spam Destroyer
Spam Destroyer
9. NoSpamNX
NoSpamNX
10. SI CAPTCHA Anti-Spam
SI CAPTCHA Anti-Spam
11. WP Anti Spam
WP Anti Spam
12. Antispam for all Fields
Antispam for all Fields
13. Growmap Anti Spambot
Growmap Anti Spambot
via：http://themesurface.com/wordpress/anti-spam-widgets-for-wordpress/
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