Auctions for WooCommerce GPL Overview:
Auctions for WooCommerce is a professional auction plugin that extends your WooCommerce store with a new custom product type: auction. Auction items with normal, reverse, silent, or proxy auctions. And you can use Auctions in conjunction with the Product Vendors plugin to create an eBay-style site where users can auction off their own items.
Auctions for WooCommerce is customizable via templates and supports hooks, translations, and WPML. It also includes auction-specific features like anti-sniping, live ajax bid refreshing, live bid browser notifications, different types of sorting.