Ty Carlson

This plugin allows you to use iThemes Exchange Product Categories to organize related products and then display them alongside a product. 
Choose how many related products you would like to display, as well as adjust widths of the grid to best fit your theme.
Plugin includes various hooks and filters to allow customization of the display of the related products.

Category Related Products for iThemes Exchange

Display related products based on Product Categories on a single product screen to help boost sales.

Wonderflow BV

This plugin is no longer available

Category Related Products for iThemes Exchange vs Wonderflow