"Social Stream is an open source platform on which to build websites with social networking features. It provides the basic features of a social network such as Facebook, Google + or LinkedIn"
"Web Intents is a framework for client-side service discovery and inter-application communication. Services register their intention to be able to handle an action on the user's behalf. Applications request to start an Action of a certain verb (share, edit, view, pick etc.) and the system will find the appropriate Services for the user to use based on the user's preference. "
This makes replicated computation as easily as replicating data - and makes synchronization of all events across multiple peers a fundamental property of the system.
Open Cobalt is a free and open source software platform for constructing, accessing, and sharing virtual world both on local area networks or across the Internet, without any requirement for centralized servers.