Open Source content management systems:
- Joomla! (http://www.joomla.org)
- Drupal (http://drupal.org)
- WordPress (http://www.wordpress.org)
- Flickr (http://www.flickr.com)
- Photobucket (http://photobucket.com)
- Picasa Web Albums (http://picasaweb.google.com)
- YouTube (http://www.youtube.com)
- Vimeo (http://vimeo.com)
- Gimp (http://www.gimp.org)
- Irfanview (http://www.irfanview.com)
- Open Office (http://www.openoffice.org)
Further Open Source Resources:
- Source Forge (http://sourceforge.net)
- Open Source Initiative (http://www.opensource.org/)
- Open Source software info (http://en.wikipedia.org/wiki/Open-source_software)
Programming languages, application frameworks and databases:
- HTML (http://en.wikipedia.org/wiki/HTML)
- CSS (http://en.wikipedia.org/wiki/Cascading_Style_Sheets)
- PHP (http://en.wikipedia.org/wiki/PHP)
- ASP (http://en.wikipedia.org/wiki/ASP.NET)
- MySQL databases (http://en.wikipedia.org/wiki/MySQL)
- Microsoft SQL server (http://en.wikipedia.org/wiki/Microsoft_SQL)