USData Factory Link used to be a primarily UNIX system and they historically had multiplaform, multi OS support. I don't know if that is still the case or not. Browse through the links on this site, you will find some implementations of HMI for Linux as well.
The AccessPoint 7 product is available currently for Linux Red Hat 7.3.
AccessPoint has been installed, in other versions, on SUN, SGI, DEC RISC platforms. Special arrangements can be made for the latest 7 version as required. Recently, SUN has been the platform chosen by ABB for AccessPoint.