WooCommerce has grown to be the most popular eCommerce solution online. It's effectiveness stems from the WordPress plugins that extend and improve the core functionality of stores.
This page lists effective WooCommerce plugins that you will find useful.
One Click Upsells is a WooCommerce extension that helps you promote upsells and downsells to customers.
This helps you create an automated sales funnel. It integrates with all popular payment systems and provides reports to help you see where sales are being generated from. The plugin is available from an effective rate of $25 per month if you choose to pay annually.