NopCommerce is a fully customizable shopping cart. It's stable and highly usable. nopCommerce is an open source e-commerce solution that is ASP.NET 4.0 based with a MS SQL 2005 (or higher) backend database. Our easy-to-use shopping cart solution is uniquely suited for merchants that have outgrown existing systems, and may be hosted with your current web host or our hosting partners. It has everything you need to get started in selling physical and digital goods over the internet.
NopCommerce offers unprecedented flexibility and control. Since it is open-source, nopCommerce’s source code is available free for download.
It support lots of payment option such as Credit Cards, Paypal, CCVenue, Google Checkout, Paypal Express and many more to fit on any solutions. As Nopcommerce source code comes as free so it can be easily extended to any label of requirement. It support any plug-in provided by Nopcommerce.