Magento - the No. 1 in E-Commerce.
In the international arena, Magento, the eCommerce system from the United States, has been the market leader for years. But it can not be argued away: the top dog among e-shops has come a bit old. Magento 2.0 was postponed several times, a release date is not fixed today.
Nevertheless: If standard e-commerce functionality for a medium to large web store is needed, one can choose not entirely wrong with the open source version of Magento: The large range of functions, such as an integrated order and customer management, integrated SEO features and analysis and included reporting functions, has proven itself in over 100,000 installations worldwide.