crosser

drupal.org/project/ubercart

Ubercart is an e-commerce suite developed for Drupal. It has been designed with the end user in mind, focusing on usability in three key areas: store configuration, product and catalog creation, and order administration.

drupal.org/project/drigg
Drigg is a powerful Drupal module that allows you to create Digg and Pligg-like web sites.