Good Gear Guide
In Pictures: 35 open source and free tools to mana...
3. Broadleaf Commerce
This enterprise-level e-commerce platform can be customized to specific business needs. Broadleaf Commerce features options to manage customer accounts, upsell, create promotions and also manage email marketing campaigns and social media integration. The Broadleaf Commerce community provides an online forum for discussion and contributions, articles, development guides and project API documentation. Broadleaf Commerce uses the Apache license.
In Pictures: 35 open source and free tools to manage your online store