What is the best open source ecommerce cms? I want to build a new online store and I want to use an open source cms. I have heard of magento, Prestashop, and Shopify. I'm not sure which one to choose. I want to use an ecommerce cms that is easy to use, has a lot of features, and is popular.I'm curious as to what others think is the best open source ecommerce cms. Perhaps I can get some ideas to help me make my decision!