I am one of the odd people using the Linux operating
system. Well, that was about 5 years ago, when I started with the
venerable version 1.0.9 (2.0.29 now), but that (the oddity) seems
to be changing.
As Donal K. Fellows, another tcl'er, tells us:
Never underestimate the power of the penguin...
The other thing I am using often is the scriptlanguage Tcl,
invented by John Ousterhout. Due to its importance to me I gave it
its own page.