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Magento is an ecommerce platform on PHP which is quite feature rich.

This platform is based on the Zend Framework.

You can take a look at a Magento store and the admin demo over at their demo section.
 

The minimum system requirements for getting onto Magento is PHP 5.2.1with a few mandatory extensions and MySQL 4.1.

Some of the notable features of this platform are:

• Analytics and reports – integration with Google Analytics, RSS feeds on Orders and feedback, Sales reports
• Catalog Management and Browsing
• Customer Accounts – with order status, default addresses, wishlists and dashboard
• Order Management – edit, create and complete orders, print invoice and packing slips
• Payments – Integration with Paypal, Google Checkout and Authorize.net; Accept purchase orders, cheques and money order.
• SEO Optimizations – url rewrites, Google Sitemaps and more

Links:
Magento Home
Screenshots
Tour
Store and Admin Demo