nopCommerce is the leading ASP.NET based open-source eCommerce platform. It is a free solution with comprehensive features that is applicable for all types of users from new online businesses to the most demanding enterprise-level eCommerce experts. nopCommerce is one of the most secure, stable and extendable shopping carts. The platform has a rich architecture with lots of features available out of the box. There is also a lot of additional functionality that one can find in the marketplace. Free support on community forums is available.
E-commerce technologies cut transaction costs by allowing both manufactures and consumers to skip through the intermediaries. This is achieved through by extending the search area best price deals and by group purchase. The success of e-commerce in urban and regional levels depend on how the local firms and consumers have adopted to e-commerce. 
2Checkout (formerly Avangate) is the digital commerce & payments provider that helps companies sell their products and services via multiple channels, acquire customers across multiple touch points, increase customer and revenue retention, leverage smarter payment options and subscription billing models, and maximize sales conversion rates. The company’s clients include ABBYY, Absolute, Bitdefender, FICO, HP Software, Kaspersky Lab, and many more companies across the globe. Avangate acquired 2Checkout (www.2checkout.com) in March 2017. Companies select our solution to: - Sell More Digital Goods Globally - Maximize Customer Lifetime Value - Accelerate Time to Market - Get Integrated Recurring Revenue Management - Leverage New Distribution Channels More info on www.avangate.com and www.2checkout.com
Shopify is another strong ecommerce software option. Their mission is to make selling online as fast and simple as possible. They nailed that, but their SEO has some holes. Weak ranking performance, rigid URL structures and a WordPress plugin that uses iFrames highlights my concerns with their SEO. Moreover, you can’t customize Shopify’s checkout page.
The good news is that you don’t need to spend a fortune to get more people to see your products. There are plenty of ways to market your ecommerce store on a budget, and once the sales start rolling in, you can scale up those same methods for even better results. For example, you can use social media sites like Instagram to market your products without spending a cent.
Next up, ThemeForest is a massive repository for WordPress themes, and even features its own WooCommerce section. Inside, you’ll find hundreds of premium themes for the ecommerce platform, targeting a broad range of niches. If you’re looking for a theme that includes features relevant to your particular industry, ThemeForest is probably the right place to look.
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It’s a powerful platform with features to support personalised shopping experiences, efficient merchandising as well as the rapid launches of commerce sites for different brands, markets, or campaigns. Oracle ATG Web Commerce also has native features that allow merchants to sell more complex product lines and data-rich products, such as those that require shopper information.
Bigcommerce also has a nice library of themes for you, divided into multiple categories, and all of them responsive and fully customizable. They were developed to establish a more modern, fluid user experience, utilizing cool new merchandising features for categorization and differently sized catalogs. There are both free and paid options available, and I have to say that those free ones really are attractive-looking.