Solidus is a complete open source ecommerce solution built with Ruby on Rails. It is a fork of Spree. Its feature include Inventory management, Product management, Taxonomy, Order management, Customer management, Rest API, Fully customizable front end, Multi tenant, Payment gateway integrations, Promotions, Analytics and lot more.

Solidus - eCommerce solution built with Ruby on Rails

PrestaShop is a free, open-source e-Commerce shopping cart software that allows you to open your own Internet business in just a few clicks. It has more than 310 features include Catalog Management, content management, Product Displays, Site Management, S.E.O, Checkout, Shipping, Payments, Marketing, Client Account, Translations, Security, Localization/Taxes, Analytics and Reporting and lot more. 
 
It supports payment gateways such as Google Checkout, Authorize.net, Skrill, PayPal.

PrestaShop is a free, open-source e-Commerce shopping cart software that allows you to open your own Internet business in just a few clicks. It has more than 310 features include Catalog Management,  content management, Product Displays, Site Management, S.E.O, Checkout, Shipping, Payments, Marketing, Client Account, Translations, Security, Localization/Taxes, Analytics and Reporting and lot more. 

Prestashop - Free Open-Source shopping cart software for Web 2.0

Sylius is the first eCommerce framework for tailored solution based on Symfony and Doctrine. The highest quality of code, strong testing culture, built-in Agile (BDD) workflow and exceptional flexibility make it the best solution for application tailored to your business requirements. Powerful REST API allows for easy integrations and creating unique customer experience on any device.

Sylius - eCommerce PHP framework built on top of Symfony with component-based architecture and format-agnostic rendering

Spree is a complete open source e-commerce solution built with Ruby on Rails. The Spree storefront offers a full feature set and is built on common standards, so you don't have to compromise speed to market, efficiency or innovation. The modular platform allows you to easily configure, supplement or replace any functionality you need, so that you can build the exact storefront that you want.

Spree - Headless multi-language / multi-currency / multi-store e-commerce platform

nopCommerce is the best open-source eCommerce shopping cart solution. nopCommerce is free, and it is the most popular ASP.NET eCommerce platform. nopCommerce supports a mobile version of your website with a compelling, feature-rich and graphically pleasing storefront, and it provides means for retailers to immediately deliver relevant offers, promotions and products. Its feature include Multi store, Multi vendor, SEO, Payment methods, Shipping methods, Tax features, Marketing, Stock management and lot more.

nopCommerce - The most popular open-source eCommerce shopping cart solution based on ASP.NET Core 

A headless GraphQL ecommerce framework built on Node.js with Nest & TypeScript, with a focus on developer productivity and ease of customization. It delivers content through its GraphQL API, leaving you free to implement your store-front applications in the technologies of your choice. 
 
Its features include:
<ul>
<li>Inventory Management</li>
<li>Faceted search</li>
<li>Guest checkouts</li>
<li>Pluggable payment, shipping and fulfillment</li>
<li>Multiple language</li>
<li>Multiple currencies</li>
<li>Multiple sales channels</li>
<li>Media Management</li>
<li>Built in admin UI</li>
<li>Shipping and Fullfillment</li>
</ul>

A headless GraphQL ecommerce framework built on Node.js with Nest & TypeScript, with a focus on developer productivity and ease of customization. It delivers content through its GraphQL API, leaving you free to implement your store-front applications in the technologies of your choice. 

Vendure - A headless GraphQL ecommerce framework for the modern web

ZenCart is a PHP based e-Commerce Shopping Cart Software. ZenCart is easy to install. Products, Customers, Pricing, Payment and Shipping could be easily managed by administrators. It is built on top of osCommerce. It supports Multiple gateway services, Sales, Discounts, Gift certificate, Audit trail, Newsletter manager, Advertising banners, Tax rate configuration, multiple shipping options and lot more. 
 Sourceforge project hosting:<A HREF="http://sourceforge.net/projects/zencart" target="_blank">http://sourceforge.net/projects/zencart/</A>

ZenCart is a PHP based e-Commerce Shopping Cart Software. ZenCart is easy to install. Products, Customers, Pricing, Payment and Shipping could be easily managed by administrators. It is built on top of osCommerce. It supports Multiple gateway services, Sales, Discounts, Gift certificate, Audit trail, Newsletter manager, Advertising banners, Tax rate configuration, multiple shipping options and lot more.

Zen Cart - A PHP based e-Commerce Shopping Cart Software

osCommerce allows store owners to setup, run, and maintain online stores with minimum effort. It could be easily integrated in to the existing site. Administrator could add categories, products, manufacturers, customers, and reviews. Multilingual and Multicurrency support. It accepts numerous online (PayPal, 2CheckOut, Authorize.net, iPayment, ..) and offline (cheque, money orders, offline credit care processing) payments. osCommerce has built a showcase of over 12,700 online shops that have been voluntarily added to the live shops section, and powers many thousands of more online shops worldwide.

osCommerce allows store owners to setup, run, and maintain online stores with minimum effort. It could be easily integrated in to the existing site. Administrator could add categories, products, manufacturers, customers, and reviews. Multilingual and Multicurrency support. It accepts numerous online (PayPal, 2CheckOut, Authorize.net, iPayment, ..) and offline (cheque, money orders, offline credit care processing) payments.

osCommerce - Open Source Online Shop eCommerce Solution

BigFish is a world class solution that leverages the power of the Open for Business (OFBiz) open source project. OFBiz is the foundation for thousands of eCommerce and ERP solutions. BigFish extends, enhances and simplifies OFBiz. All the necessary revenue-enhancing features have been added to a solid, stable foundation. The solution is open, flexible, production-ready, and scalable. Its features include Customer Management (CRM), Order Management, Catalog Management, Promotion Management, Paypal support, Guest checkout, Full text search and lot more.

BigFish is a world class solution that leverages the power of the Open for Business (OFBiz) open source project. OFBiz is the foundation for thousands of eCommerce and ERP solutions. BigFish extends, enhances and simplifies OFBiz. All the necessary revenue-enhancing features have been added to a solid, stable foundation. The solution is open, flexible, production-ready, and scalable.

BigFish eCommerce - eCommerce and ERP solutions

TomatoCart is a new and distinctive open source shopping cart solution. It employs Web2.0 technology such as Ajax and Rich Internet applications (RIAs).Tomato Cart’s application mimics the user experience of desktop Operating System, offering features and applications similar to a PC environment. 

TomatoCart - Online Shopping Cart Solution

Cezerin is React and Node.js based eCommerce platform. Allows creating a Progressive Web Apps. It feature include list Product details, Product categories, Inventory and stock management, Orders, Pages, Shipping and payment methods, Payment Gateways,  Checkout options, Theme Settings, App store, Server-side rendering (SEO friendly) and lot more.

Cezerin - Ecommerce Progressive Web Apps

Magento provides feature-rich eCommerce platforms that offer merchants complete flexibility and control over the presentation, content, and functionality of their online channel. Catalog could be browsed using Faceted Navigation. It supports features like Product comparisons, Product Reviews, Catalog Management, Multi-Lingual, Multiple Currencies, Multiple Payment Options, Analytics and Reporting, Discount coupons and lot more.

Magento - eCommerce Software for Growth

Arastta is the next generation of Open Source eCommerce software built with modern technologies such as Symfony, Bootstrap, jQuery, Swift Mailer, RESTful API etc. Arastta is built with the best and most advanced features that marketers, sellers, admins and developers in mind. Arastta is fully responsive with its core. Sell with Arastta on every device. It supports App Store, Theme Manager, Simplified checout, Ajax Search, SEO Support, Caching support and lot more.

Arastta - Solid, Free, Open Source, Community Driven eCommerce

SeoToaster is the most advanced SEO & marketing CMS and eCommerce shopping cart platform that can be used right out of the box, with no plug-ins required. The SeoToaster cms features a uniquely intuitive content management system interface, combined with powerful automated marketing. It is W3C compliant HTML code generation, no layout restriction, unbreakable theming system, unmatched SEO, or automated merchandising are just few of the many built-in features.

Seotoaster - CMS with Shopping cart and Cloud based Marketing Platform

AbanteCart is a free open source ecommerce platform to power online retail. AbanteCart is a ready to run web application as well as reliable foundation to build custom eCommerce solutions. AbanteCart ecommerce platform is designed to fit a wide variety of online businesses and applications, as well as can be configured or customized to perform very specific business requirements. Chosen by many shop owners launching their business online for the first time, AbanteCart is also picked by developers looking for a user-friendly interface and powerful features set.

AbanteCart - PHP based eCommerce solution

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