mmfilesi

This plugin shows in the sidebar n post related with the same category(s) of post being viewed. 
The result can be random or chronological order.
Este plugin es un widget que se incluye en el sidebar. Muestra n entradas relacionas con la entrada que se ha cargado. 
Los resultados pueden ordenarse de forma aleatoria o por orden cronologico.
<h3>Donations</h3>
http://www.mmfilesi.com

mmfilesi-random-post

This plugin shows in the sidebar n post related with the same category(s) of post being viewed.

theseforumslookquitehelpful

This plugin was built to add a “Random” Product Sorting Order to WooCommerce with working pagination.
Other solutions I found that added a “Random” Product Sorting Order did not preserve pagination.
This plugin will sort your WooCommerce Products in random order. A random sort has a transient life of one hour. (In version 0.9.1, the duration is not a settable option. It is fixed at one hour.) Every hour a new random sort is generated. Pagination works as expected, meaning each WooCommerce Product will be diplayed once and no more than once.
This plugin requires the WooCommerce plugin.

WooCommerce Random Product Sorting with Pagination

Add a "Random" Product Sorting Order to WooCommerce with working pagination.

mmfilesi-random-post vs WooCommerce Random Product Sorting with Pagination