Odoo just released it's Open Source Website Builder
in version beta. The stable version will be released in august 2014 as part of the version 8 of Odoo. They key features of Odoo Website Builder includes a full inline editing with awesome building blocks, a full integration with business apps, an eCommerce, a blog, a quotation builder, live chats, SEO optimized mechanism, mobile.
The Odoo website builder and Odoo eCommerce
is fully integrated with all Odoo business apps: accounting, warehouse management, CRM, human resources recruitments, etc.
You can get an overview of Odoo Website Builder and eCommerce here: