Cart66 is described as 'With the Cart66 WordPress e-commerce plugin you can start making money with any WordPress website - even using free themes. Take donations, sell your own music, or have people subscribe to your services. You can sell just about anything with Cart66' and is an app in the Business & Commerce category. There are more than 50 alternatives to Cart66 for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Windows, Linux and SaaS. The best alternative is WooCommerce, which is both free and Open Source. Other great apps like Cart66 are OpenCart (Free, Open Source), Shopify (Paid), Adobe Commerce (Free Personal, Open Source) and Shopping Cart Elite (Paid).
Commerce Kickstart is Drupal Commerce packed with features that make it more complete, faster to launch, and easier to administer. It's free, supported by an active developer community, and backed by Commerce Guys' unmatched expertise.
StoreHippo is the SaaS based E-commerce platform provides comprehensive solutions to startups, SMEs and corporates to set up their own online store and mobile web application without spending heaps and bounds on technology.
Duceplus is an impressive product from Technoduce which allow you to buy and sell under single platform. The site reflects up-to-date inventory management. The minimum re-order level can be triggered by the site.