Working together, volunteer computing
BOINC (Berkeley Open Infrastructure for Network Computing). By joining this community you offer your computing resources to science. The idea is simple, for research and simulation, computers are needed, the world has a lot of such devices, so why not link them together by use of the Internet and let them share the burden of calculating stuff. The fields of research range from physics, space (ex: seti), medicine, genetics, mathematics, etc. Chose one or more projects that you want to support and make a difference.
You can read the most complete project list -> here <- or a more summarized version -> here <-
Linux is supported, download -> here <-.