BigCommerce and Magento Community Edition are two different implementations of one solution. Both variants are good, but each of them has some special features. Thus, Magento and BigCommerce have slightly different target audience. With both Magento and BigCommerce you can create a stunning look for your brand and e-commerce shop, but BigCommerce has some restrictions on different interface elements placement.
PrestaShop is a free and open source solution for e-commerce stores. Among its supported payment gateways are DirecPay, Authorize.Net, Google Checkout, Skrill and, of course, PayPal. The system contains over 250 features and more than 1000 add-ons for different areas of activity. The main features of PrestaShop are:
Shopify has been in business since 2006. During last 8 years company gathered about 50 thousand online retailers. Shopify has proprietary code, which is available only among company’s developers. Magento exists since 2008, but in 2011 it was purchased by Ebay. Unlike Shopify – Magento is open source.
UPD (16.04.2014): A brand new marketplace is coming soon
UPD (02.05.2014): Introduction to Sellvana Module Development Webinar
UPD (10.07.2014): Sellvana Theming Webinar
UPD (12.06.2015): Sellvana Public Alpha has been released