OpenCart is a free open-source eCommerce platform for building retail online business. It is a great solution for medium and big eCommerce businesses. Besides a huge number of free and premium OpenCart themes available, OpenCart also allows users to develop new extensions for various functionalities. However, it will take your time to select a must-have OpenCart extension among the mass of extensions. We would like to pick 7 Best OpenCart Extensions for Launching Online Stores to help you quickly find your ones.