As online sales increase, people are purchasing more digital items that can be downloaded such as ebooks, music, videos, or software. E-commerce sales in general have increased from $40.4B in 2003 to over $112B in 2009, according to the US Census Bureau
If you want to sell products that customers can download from your website, there are quite a few ways to accomplish this.
You can use several different Content Management Systems(CMS) such as WordPress, Virtuemart, PrestaShop, or Opencart among many others. We will now go over these popular options for offering downloadable content from your website.
Wordpress was originally designed for blogging, but the ability to offer downloadable products can be added to it. One of the most popular plugins for selling products in Wordpress is WP e-Commerce:
Virtuemart is a free, open source extension for Joomla! that adds eCommerce functionality. It does not include the ability to sell downloadable products, but you can purchase an extension that adds this option. Here is a guide for one of the most popular and affordable options (Downloads for Sale).
Products like ebooks, music or images can be added as Virtual Products in the PrestaShop catalog, and sold. First you must create a product category:
Then you can add and manage a virtual product in the Catalog of Prestashop:
With OpenCart, it is a 2-step process to offer downloadable content.
First you must add the downloadable content to the catalog:
Then enable the download option
Ubercart for Drupal
Ubercart is an addon module for Drupal that adds E-commerce abilities, that let you sell digital products.