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simple captcha
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The captcha plugin keeps WordPress sites safe from spam and password hacks by requiring a simple test to prove you're human, not a computer.
WordPress
Simple and Easy CAPTCHA. Protects WordPress forms against spam bots by using a picture based challenge enabling users to solve it quickly and easily
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WP Light Captcha is very simple and lightweight captcha plugins for your WordPress site.You can protect unwanted login request from hackers.
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WordPress
Captcha image for registration page, customize according to your theme.