eCommerce systems with demo

Question

I want to try some eCommerce systems to take look of how they implement the diffentent aspects

• Items publication
• Stock
• Sells
• Return
• Etc, Etc

I'm developing a system myself (web application writen in PHP) and I have the feeling than I'm over complicating the process in several parts (particularly in the relations between products and stock loading)
I found and tried some systems but in all the cases the demos/free account are very basic and don't cover the areas I want to look at.

The systems can be writen in any platform, I only want to take ideas from the interface, not to look at the code.

Before someone says it's a subjective question. I'll accept the first answer that can give me a clue with the products relationships.

Answer 1

http://php.opensourcecms.com/scripts/show.php?catid=3&category=eCommerce

They have a selection of (open source) ecommerce demos running you can check out.

Answer 2

If it's the interface you are concerned with, then looking at existing software is not a good idea. They're one crappier than the other. Seriously, they suck.

It is better to educate yourself about good UI design from the works of professional UI designers and usability experts. For example, useit.org