moltin is described as 'Inventory, cart, checkout, payments & more through a simple API' and is an website in the Business & Commerce category. There are more than 100 alternatives to moltin, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Windows, Linux and SaaS. The best alternative is PrestaShop, which is both free and Open Source. Other great sites and apps similar to moltin are WooCommerce (Free, Open Source), OpenCart (Free, Open Source), Shopify (Paid) and Thirty Bees (Free, Open Source).
Payhip is an e-commerce platform that enables anyone to sell ebooks directly to their fans and followers using just a link. You can simply upload your product, enter the price and start selling on Twitter, Facebook or your own website.
CubeCart is a hugely popular and very established open source eCommerce solution. A fantastic shopping cart which is easy to install, with a committed group of forum members eager to answer any CubeCart question.
Builderfly is an all-in-one Ecommerce platform to create web and mobile app stores. It is easy to use and highly customizable online builder and loaded with features with whatever required by any Ecommerce vendor. 14 days free trial is available.