What ERP systems are e-commerce companies using?

Open ERP is a good solutions for ecommerce vendors. Open ERP is integrated with e bay, amazon, FedEx, UPS and Magneto.

This is something depend on requirement. Openbravo is majority used with Magneto ecommerce solution.

If you want to be successful online and keep up with increased demand for digital ordering functionality, your eCommerce strategy should include integration to your ERP, account and inventory software. Here are many ERP software in market. You can compare ERP software with demo, pricing, features and more.