WooCommerce Quick View Extension GPL Overview:

Show a quick-view button for product details

The quick view plugin adds a ‘quick view’ button to product loops which shows product details in a lightbox when clicked:

Quick-view has two optional triggers; you can either show a ‘quick view’ button in your loop, or you can set non-ajax add to cart buttons to open the lightbox on click (handy for showing variation details as pictured for instance).