First there was Unix...

First there was Unix... Now there's AIX, AU/X, BSD, BSDI, Dynix, EP/IX, FTX, Hurricane, HP-UX, Irix, Linux, Mach, Minix, Open Desktop, OSF/1, OSx, PC/IX, Plan 9, Polyx, Posix, QNX, Risc/OS, Risc/ix, SCO Unix, Sinix, Solaris, Sprite, SunOS, SVRx, Topaz, Tunis, Ultrix, Unicos, V, v10, Xenix, ..."