wooassist

This plugin adds a custom field in the checkout page to ask your customers where they heard about your store.
This plugin also offers an “Other” field where your customer can provide a specific answer in a separate textbox.
Features:
<ul>
<li>Easily change the labels and choices for the custom field in the checkout page.</li>
<li>View reports on the “Reports” section in WooCommerce.</li>
<li>Enable/disable the custom field to be required on checkout.</li>
<li>Enable/disable the “Other” field.</li>
<li>Modify order statuses you want to include in the reports.</li>
<li>Export Orders with Customer Source field</li>
</ul>

Where Did You Hear About Us Checkout Field for WooCommerce

Adds a custom field in the checkout page to ask your customers where they've heard about your store.

Automattic

WooCommerce

WooThemes

Rynald0s

Tiago Noronha

A simple plugin that adds custom “Contact” homepage section to Storefront. Customise the display by adding your contact details via the Customizer.
This plugin requires the Storefront theme to be installed. Jetpack is required for the contact form.

Storefront Homepage Contact Section

There is no way to put the captcha, put extra plugins do not work. And without captcha there is a lot of spam, I do not advise you to install this plugin

Lots of spam

Add a "Contact" section to the Storefront homepage.

Where Did You Hear About Us Checkout Field for WooCommerce vs Storefront Homepage Contact Section