Sean Davis

Built for use with the Easy Digital Downloads plugin, this extension provides settings for the display of the [download_checkout] shortcode when no items are in the cart.
Follow EDD Empty Cart’s development on <a href="https://github.com/sdavismedia/edd-empty-cart" rel="nofollow ugc">Github</a>.

Easy Digital Downloads – Empty Cart

Just installed, still works!

Easily add content to the empty cart display in Easy Digital Downloads.

Andrew Norcross

Liquid Web

Set a time limit on a customer checking out. Include a “time to check out” 
countdown to encourage your customers to complete their purchase.
Features
<ul>
<li>CSS based countdown display</li>
<li>available actions and filters to modify functionality.</li>
</ul>

WooCommerce Cart Expiration

Set a time limit on a customer checking out.

Easy Digital Downloads – Empty Cart vs WooCommerce Cart Expiration