Xfree86 is the commonly-used but bastard stepchild of X. X started on DEC, Sun, HP, SGI unix boxes, Linux came later. Linux is and was awesome, I still recall

Xfree86 is the commonly-used but bastard stepchild of X. X started on DEC, Sun, HP, SGI unix boxes, Linux came later. Linux is and was awesome, I still recall installing it using boot/root floppy disks, but X was around well before the '386 machine in the corner being used for CD creation was recognized as "Hey, this is actually useful"...