kazuhiroyamada

Enables you to put inquiry button in your wordpress page and send inquiries. 
http://tayori.com
Tayoriお問い合わせボタンを簡単に設置することができます。 
http://tayori.com

Tayori Form Plugin

tathemes

Inquiry Form for Woocommerce just replace your add-to-cart button by a custom button which will bring a popup with a form. The data of the form will go to the admin email. 
If you need to put a quotation or inquiry form instead of add-to-cart in Woocommerce single product page then this plugin is fantastic.
Demo:
<a href="http://akramul.com/plug-dev/shop/" rel="nofollow ugc">LIVE DEMO</a>
<h4>Features</h4>
<ul>
<li>Simple & Intuitive</li>
<li>Option for using built-in form or custom form</li>
<li>Bootstarap switcher</li>
<li>Very easy to use</li>
</ul>

WDU Inquiry Form

WDU Inquiry Form will replce default Add to cart button

Tayori Form Plugin vs WDU Inquiry Form