K2 is one of the most popular and advanced CCK (content construction kit) solution for Joomla. It's free and included in the demo package. Also you can download its latest version from GetK2.org website.
Newskit is content publishing solution for Joomla. You can display Joomla Articles, K2 contents, MijoShop products and VirtuMart products with it. This module is included in the demo package.
Optimum Slider is a slideshow module which can display your custom text, K2 or Joomla Article items on your module, easily. This module is included in the demo package.