I love the architecture of the code solution and customisation .Everything thing is loosely coupling.

Nopcommerce is one of the most widely used cross open-source platforms that can be easily customized, and under that you can easily create any website. It's plugin system is also very nice. Nopcommerce is very easy to configure. Nopcommerce deployment is very easy and quick.Nopcomemerce releases upgrades frequently by which you can learn much. Even SQL, PostgreSQL & MySQL configure is very easy. Using nopcomemerce you can easily do third party integration like payment integration, shipping integration, ERP integration, inventory management, etc. nopcommerce has the most liked feature for multiple stores with multiple languages ​​with multiple currencies. you can also make any custom theme under nopcommerce

You have the basic solution of Ecommerce with code and database so you can easily customize it as well.