WooCommerce Show Single Variations GPL Overview:

WooCommerce Show Single Variations allows you to display individual product variations of a variable product in your product listings. You can choose to display each variation in any or all of the following: All single variations can be added to the cart as a normal simple product can be, directly from the product listing. If you were to click on a single variation, you would be taken through to the parent variable product page, with the variation options pre-selected.