The most popular open-source eCommerce shopping cart solution
Simple Modern Ecommerce in NodeJs. Using Mongodb.
RhinOS, CMS, Content Management System, Josep Sanz Campderrós
Open Source ASP.NET MVC Enterprise eCommerce Shopping Cart Solution
Nash Operating System for Modern Ecommerce
A complete free web-based 3D interior planning script.
Open source membership software.
KonaKart Java eCommerce