Saurus CMS is content management system used to run and maintain websites. Project was started around 2001 and developed by Saurused Ltd located in Tallin Estonia. Around 2010 they released first open-source version of the software as Community Edition. Now the product is discontinued publicly and should not be used anymore. If you still run web sites using Saurus please migrate to different CMS software. Their blog post states:
Over the last decade we have done our best on creating a solid framework for web developers and offering an intuitive tool for daily content editors. But the world has changed a lot since we started 12 years ago. Content management market is dominated by global open source platforms and unfortunately some must disappear to make a way for others.