WooCommerce is the leading eCommerce platform for WordPress. It is an open source, full featured and fully extensible eCommerce platform. The great thing is that it is free to start using, all you need to do is host a WordPress website and install the plugin. It allows you to use virtually any payment provider under the sun, a great advantage over sites like Squarespace where they force you to use their own providers. We love using WooCommerce, it’s slightly tricky to configure over the likes of Shopify (which is generally more expensive as well), but once it’s going it’s a pleasure to use.