It is easy to setup, quick loading speed and safe payment gateways are two other major reasons why Shopify is a good choice for launching an online store in 2016. Shopify also provides you with hundreds of templates to customize your store’s landing page and give it the custom look you desire.
It is pretty much like Shopify, except that it has more built-in features. For starters, with BigCommerce you get a fully functional website, unlimited bandwidth & storage, as well as freedom to add as many products as you want. Plus, essential ecommerce features like gift cards, reviews & ratings, as well as basic marketing tools are also built-in in BigCommerce software.
Opencart is another open source CMS for ecommerce. Though it has one of the easiest to use backends.