Themes - nopCommerce
nopCommerce Documentation
https://www.nopcommerce.com/en
nopCommerce is an open-source eCommerce solution based on Microsoft's ASP.NET Core framework and MS SQL Server 2012 backend Database. It provides a catalog frontend and an administration tool backend, allowing shopping cart creation.
nopCommerce has a theme based frontend architecture where you can select different theme for your store. In this video we have gone through the basics of themes in nopCommerce.