PluginsPoint

<p>This is an extremely very simple contact form with AJAX which you can use whether in posts or in pages very easily. Using this, site’s admin will get the email. You just need to put the shortcode [kento_contact_form] in any page/post. Email will be sent to admin without page refresh.</p>
<p>Live Preview: http://pluginspoint.com/</p>
<h4>Features</h4>
<ul>
<li>Contact form with ajax.</li>
<li>Shortcode System.</li>
<li>Easy to use and update</li>
</ul>


Kento Ajax Contact Form

Beherit

<p>Lightweight and simple contact form with no additional user-unfriendly options. You can add the contact form to any page with a shortcode <code>[contact_form]</code>. Plugin is integrated with plugin <a href="https://wordpress.org/plugins/akismet/" rel="ugc">Akismet</a> and <a href="https://wordpress.org/plugins/grecaptcha/" rel="ugc">GreCAPTCHA</a> which protect against spam.</p>


Lite Contact Form

Lightweight and simple contact form with no additional user-unfriendly options. Can be additionally protected against spam by using Akismet and Google …

Kento Ajax Contact Form vs Lite Contact Form