RomanCart is described as 'converts any existing website into an online store. No need for website templates or expensive redesigns' and is an website in the business & commerce category. There are three alternatives to RomanCart, not only websites but also apps for PHP, Self-Hosted solutions, SaaS and Linux. The best alternative is Snipcart. It's not free, so if you're looking for a free alternative, you could try GoCommerce.
Using simple HTML markup, turn any existing website into an extensive shopping cart platform. Snipcart allows payment processing, shipping estimates and order management without ever letting your customers leave your website.
Ready to use multilingual online shopping cart to help you build ecommerce websites: responsive front-end design, SEO friendly URLs, multiple payment options, voucher system, automatic shipping and tax fulfillment, client address book and more.