Ubercart is an open source plug-in for Drupal.  Drupal is built in a modular manner, and Ubercart snaps into its modular system to take advantage of many of the other Ubercart modules.

After working with many other shopping cart systems, Ubercart has risen to the top for Digital WorkHorse.  Its strength is its ability to sell anything including:

• Community Access
• Timed/Restricted Access
• File Downloads
• Physical Products
• Premium Content

You can effectively sell system roles, which allow for customized access to specific content.

The cart checkout is the slickest around, and integrates with all third party systems.

You can check out the latest Ubercart release by Digital WorkHorse at http://sproutflix.org.