GoodBooks.io - Largest curated collection of 8,500+ book recommendations.

Sellbery - Easily automate product feeds from Shopify, Magento to Amazon, eBay and other marketplaces. Fully utilize the most profitable eCommerce channels and increase sales.

Goodreads - See what your friends are reading.

Radial - Radial offers order management and store fulfillment solutions.

boook.link - boook.link is a web-based tool for creating one single link / landing page for a book, so your readers can choose from which store to buy the book.

eBay Enterprise - eBay Enterprise provides a variety of marketing, customer care, payment processing, fulfillment, fraud detection services.