QNX was novel to me "back in the day" with its whole bootable environment on a floppy disk. For 199...6? '7? that was a very neat trick indeed.
(In case you missed it, you could download a self-extracting disk image with a rudimentary web-browser, command line, text editor, and a Towers of Hanoi type game and I think it had a bezier curve screensaver but someone might want to check me out on that; again, quite novel for the mid/late 90's)
