OpenCart is a turn-key ready "out of the box" shopping cart solution. You simply install, select your template, add products and you're ready to start accepting orders. It has order management and multiple payment gateways already built in and we provide lifetime free support and free software updates. Open Source.
As an opencart expert I am willing to help you for the following issues and requirements:
1. Opencart web site creation 2. Opencart template installation, 3. Module installation and Up gradation 4. Shipping integration in opencart such as Fedex and Usps