"Flickr, the online photo-sharing Web site, is a good case study on the benefits of open source. The technology that powers Flickr is a catalog of open source tools: Red Hat Linux, the Apache Web server, MySQL databases, PHP, Perl, Smarty templates, Postfix mail gateways, and even ImageMagick to handle the image manipulation.
"Flickr is a massive collection of digital photographs from individuals all over the world, linked together by user-to-user relationships like 'friends and family' or interest groups, and by content-based associations like keyword tags and collections..."
