Wikipedia
OurGrid is an opensource grid middleware based on a peer-to-peer architecture.
OurGrid is mainly develop at the Federal University of Campina Grande ( Brazil), which also run an OurGrid instance named "OurGrid" too, in production since December 2004. Anyone can freely and easily join it to gain access to large amount of computational power and run parallel applications. This computational power is provided by the idle resources of all participants, and is shared in a way that makes those who contribute more get more when they need. Currently, the platform can be used to run any application whose tasks (i.e. parts that run on a single machine) do not communicate among themselves during execution, like most simulations, data mining and searching.