The following links are simple examples of what can be setup using open source and free software. With very reasonable hosting costs it is possible to setup a very compelling online presence using this software.
Listed is some suggestions for common open source software and tools that can be used to create a low cost high value online presence.
One of the most common web server packages in use
A free Linux enterprise based operating system
A free Linux based operating system that can be used for professional servers
Portal for Linux which has ratings that show download frequency of each distribution
Parted Magic disk management software
A powerful and free database which powers many websites
A popular content management system for use on blogs, e-commerce and more.
Installation guide for Mediawiki. Open and free wiki
The goto website for tutorials on all web technologies like HTML, CSS, Javascript and more
Getting started with ecommerce platform Prestashop
Free SSL certificate authority. SSL is essential for online security.

Installing ecommerce platform Opencart

Observatory website testing by Mozilla
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