SilverStripe is an open source content management application and PHP development framework. Initially released in 2000, and open source since 2006, SilverStripe has received numerous industry awards including Best Open Source Project in the 2010 New Zealand Open Source Awards.
SilverStripe CMS is an open source web content management system used by governments, businesses, and non-profit organisations around the world. It is a power tool for professional web development teams, and web content authors rave about how easy it is to use.