Cartpauj Register Captcha does one simple task, and does it well. It prevents SPAM signups through WordPress's default registration form.
WP Captcha prove that the visitor is a human being and not a spam robot. WP Captcha asks the visitors to answer a math questions.
Add captcha to forms easily, comment form, login form, register form, rest password form, easy to use and translate ready, no spam comments!
Custom login and registration. 自定义登录注册。