You can go with Etsy Marketplace Integration App. The app will not only help you to list products from shopify to Etsy in just few clicks but also you will be able to manage your orders and inventory from Etsy to Shopify. The app provides Real Time Synchronization for inventory so that you never face any orders related problem. Apart from these app has profiling feature through which you can customize your products in batch. You can customized price, inventory and other attributes.
Etsy Marketplace Integration also supports Multi Currency and Multi Lingual feature too.