UlisesFreitas

This plugin is built to work only for the <a href="https://wordpress.org/themes/storefront" rel="ugc">Storefront theme</a>.
How to use:
After installation go to Appearance => Customize => Gridder Products Gallery and change the values to fit your needs.
Notes:

Storefront Gridder

Adds a grid of products with a click and expand on the Storefront Homepage template.

Wombat Plugins

studiowombat

This lightweight plugin adds a bottom bar on mobile devices, like on the StoreFront theme.
FEATURES 
 * The bar links to your cart page. 
 * Allow searching products from the bar. 
 * Link to you account page. 
 * Change the design’s colors. 
 * The cart icon updates when a product is added to cart.
REQUIREMENTS 
* PHP 5.4 or higher 
* WordPress 3.7 or higher 
* WooCommerce 3+

WooCommerce Bottom Bar for Mobile

This lightweight plugin adds a bottom bar on mobile devices, like on the StoreFront theme.

Storefront Gridder vs WooCommerce Bottom Bar for Mobile