Caio Peres

Hide email from Spam Bots using a shortcode [email]your@email.com[/email]
How the plugin Work? 
The email entered within the [email][/email] shortcode is camouflaged in the source code, thus preventing bad bots that scour the internet from being able to read and find your email.
This plugin is based on standard functionality antispambot (https://codex.wordpress.org/Function_Reference/antispambot) 
Works perfectly with all themes and editors of WordPress
PT-BR 
O e-mail inserido dentro do shortcode [email][/email] é camuflado no código fonte, impedindo assim que bad bots que vasculham a internet consigam ler e encontrar o seu e-mail.
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Easy Anti Spam Bot

Hide email from Spam Bots using a shortcode [email]your@email.com[/email]

Chris Mok

GNA Google reCAPTCHA plugin allows you to implement a super security CAPTCHA into web forms. GNA Google reCAPTCHA is a free CAPTCHA service. 
This plugin can be used for login, registration, password recovery, comments forms, contact form 7.
<h4>NEED HELP?</h4>
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<h3>Languages Available</h3>
<ul>
<li>English</li>
</ul>

GNA Google reCAPTCHA

This plugin allows you to implement Google reCAPTCHA (CAPTCHA) into your web forms.

Easy Anti Spam Bot vs GNA Google reCAPTCHA