Use the idle time on your computer (Windows, Mac, or Linux) to cure diseases, study global warming, discover pulsars, and do many other types of scientific research. A BOINC project with a single Linux server can provide computing power equivalent to a cluster with tens of thousands of CPUs.
Many different projects can use BOINC. Projects are independent; each one operates its own servers and databases. Participants can participate in multiple projects; they control which projects they participate in, and how their resources are divided among these projects. When a project is down or has no work, the resources of its participants are divided among other projects.