osCommerce, formerly titled The Exchange Project, is a feature packed out-of-the-box online shop ecommerce solution for PHP web servers. Maintenance is made easy with a friendly GUI thats given to the Administration Tool.
Regrettably, osCommerce hasn't been kept up. The last release was 2008 (see www.oscommerce.com), and it's now vulnerable. HostDime, an ISP, has notified their customers of the vulnerability and given them a date by which to migrate to a different eCommerce solution. It's too bad, because it =was= a decent solution for a non-techie to implement with only a little help.