Zeus cart - shopping cart software

•    PHP

Zeus Cart is an incredibly stable & richly-interfaced, open source shopping cart and it's a simple E-commerce software package which allows, even a non-technical person to open an online store on the Internet, with minimal efforts. Zeus Cart includes a number of marketing-tailored features that can help you increase your online sales, promote repeat purchases, and boost customer satisfaction.

SimplCommerce - A simple, cross platform, modularized ecommerce system built on .NET Core

•    CSharp

SimplCommerce is licensed under the Apache 2.0 license.

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

•    PHP

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.

expressCart - A fully functioning Node

•    Javascript

expressCart is a fully functional shopping cart built in Node.js (Express, MongoDB) with Stripe, PayPal and Authorize.net payments. Note: Node.js version 7.x or greater is needed.

Solidus - eCommerce solution built with Ruby on Rails

•    Ruby

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.

laracom - Laravel FREE E-Commerce Software

•    PHP

Laravel FREE E-Commerce Software

OmniPay - A framework agnostic, multi-gateway payment processing library for PHP 5.3+

•    PHP

Omnipay is a payment processing library for PHP. It has been designed based on ideas from Active Merchant, plus experience implementing dozens of gateways for CI Merchant. It has a clear and consistent API, is fully unit tested, and even comes with an example application to get you started.

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

•    PHP

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.

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

•    CSharp

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.

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

•    Ruby

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.

nopCommerce. Open source shopping cart (ASP.NET MVC)

nopCommerce is the best open source online shop e-commerce solution. nopCommerce is available for free.

BigFish eCommerce - eCommerce and ERP solutions

•    Java

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.

Magento - eCommerce Software for Growth

•    PHP

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.

osCommerce - Open Source Online Shop eCommerce Solution

•    PHP

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.

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

•    PHP

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.

TomatoCart - Online Shopping Cart Solution

•    PHP

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.

Cezerin - Ecommerce Progressive Web Apps

•    Javascript

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.

Shopizer - Java Enterprise e-commerce Framework

•    Java

Shopizer is a Java enterprise open source e-commerce framework. Its functionality includes Product catalogue, Shopping cart, Order fulfillment, Content management, Customer care, Payment management, Shipping management and lot more.

Seotoaster - CMS with Shopping cart and Cloud based Marketing Platform

•    PHP

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.

AbanteCart - PHP based eCommerce solution

•    PHP

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.