nopCommerce is now MW compatible!
“nopCommerce is new but very popular open source e-commerce solution. nopCommerce is available for free. A solution with comprehensive features that is easy to use for new online businesses, yet powerful enough for the most demanding e-commerce expert. It’s a secure, scalable and extendable e-commerce platform.” – nopCommerce
The nopCommerce module for Merchant Warrior is available here. The author mentions that only AUD and NZD are supported, however, if specified during your application process we can enable multiple currencies at your request.