** Unix-like systems such as OpenBSD, FreeBSD and derivates of FreeBSD such as PC-BSD and also Mac OS X.
Earlier in the project we have also used other hardware such as MAC and SUN computers as well as Intel-machines (running solaris, OpenBSD. Mostly Intel CPU:s are/have been used even though we've have burned out some old Durons and Semprons in the past :)
1. It's fun and easy to participate in something so important and fascinating.
2. Interesting, very important to learn more about our universe.
3. The use of the same platform with as little problems as possible for the end systems is important - the switch from the old system scared us and others away from the project for many years but now we're back again with the new boinc software.