Here are my requirements:
- Needs to run on a lightweight open source web app framework.
- Must be open source.
- Needs to be able to run in a clustered server environment.
Here are my requirements:
There are loads of Open Source ecommerce frameworks.
We have successfully used Apache OFBiz which is java-based. Easy to install and get in action. But there is a bit of a learning curve if you want to modify the Product Model and add custom fields. This definitely can run on a clustered set of app servers like Tomcat, Weblogic.
Magento, oscommerce are leaders in the PHP space but I havent used either - so not sure if those fit all your reqts
See a bigger list here
http://blog.webdistortion.com/2008/05/03/9-kick-ass-open-source-e-commerce-platforms-reviewed/