E-Store Builder - Version 2.6 Feature for feature, E-Store Builder is one of the most powerful eCommerce Solutions in the world. Add a shopping cart to any existing website, automate your accounting, warehouse, inventory control and reporting, use the template system to create your own e-store.. you name it. Why waste time with proprietary, pay per month eCommerce systems? Run your own! A web-based front-end, and powerful back-end admin area is included Plus module structure support.