From the website:
SETI@home is a scientific experiment that uses Internet-connected computers in the Search for Extra Terrestrial Intelligence (SETI). You can participate by running a free program that downloads and analyzes radio telescope data. A command-line only version is available for Linux and other Unix based operating systems.
A similar, but more flexible, program is called BOINC. This allows you to analyze any data someone wishes to let you. There are a great number of projects out there requesting help, and you can select to run as many as you want (although only one at a time).
- Seti@Home homepage (setiathome.ssl.berkeley.edu)
- BOINC homepage (boinc.berkeley.edu)
- List of BOINC projects (boinc.berkeley.edu)