keksus

This plugin allows you send messages to email from a page, post or from any other location that you specify in template. It can be used as a shortcode or a widget. 
Has a admin settings page where you can change the names of fields, enable or disable captcha, add custom CSS code.
<h3>Live Demo</h3>
<ul>
<li><a href="http://keksus.com/ae.html" rel="nofollow ugc">http://keksus.com/ae.html</a></li>
</ul>

Ajax Message

jumbaeric

This is a conversion rate optimization plugin that adds a call to action button on woocommerce product archives or product page that opens a popup window when clicked, the name of the button and the content(contact 7 shortcode, map shortcode etc) of the pop up window can be inserted in the admin settings area.
This plugin requires you have woocommerce installed and activated.
How to use it? Visit http://itboxkenya.com/increase-e-commerce-conversion-rate-woo-short-code-popup/
Current add-ons 
* shortcode – Enter shortcode and its content will appear on the popup * popup button text
Coming soon 
* (Got more ideas? Tell me!)
If you have suggestions for a new add-on, feel free to email me at eric@itboxkenya.com. Want regular updates? Become a fan of my sites on Facebook! http://www.facebook.com/itboxkenya Or follow my sites on Twitter! http://twitter.com/itboxkenya

woo-shortcode-popup

Works well

Creates a popup button on woocommerce shop page

Ajax Message vs woo-shortcode-popup