What do you do if you're not happy with any of the current operating systems? You build your own, of course. That's exactly what Linus Torvalds did. His freely distributed, Intel-processor-based alternative to Unix, Linux (pronounced lih-nucks), is currently used by hundreds of thousands--and possibly millions--of people around the world. While Linux began life primarily as a hobby for supergeeks, the operating system has made some inroads into corporate life, particularly as an inexpensive substitute for high-priced Unix Web servers. Linux is available from a number of vendors for several hardware platforms, including Intel x86, DEC Alpha, Sun Sparc, and Motorola PowerPC.