Noostr is a content management system aimed squarely at social news networks. Sites like Reddit, Hacker News, and Digg are all social news aggregators, just like your Noostr site will be. People can sign in, submit news stories or ask questions, and everyone can vote for the best ones. Those top stories float to the front page and generate more traffic, more comments, and more votes.
Chrome Page Notes lets you take notes for Web pages as you visit them and access these notes later when you visit those Web pages again. It provides visual cues to let you know if there are notes available for the Web page that you're on. You can choose to sync your notes automatically to your Google Docs account. You can configure multiple computers to sync to the same account, and thus keep your page notes synced across multiple computers.
Shinken is an advanced monitoring system that is based on Nagios, but redesigned and rewritten from scratch while maintaining compatibility. It can monitor all IT devices from systems to end user applications. In case of a failure, Shinken can alert the operation engineers so they can promptly repair it. It has the same capabilities as Nagios along with more advanced built-in facilities such as load balanced and high availability monitoring.