There have been many trusted operating systems that have come and gone over the years. We are interested in making a list of these systems with a little information about their history. Contact Us if you know of other systems that you have seen or worked on.

• Addamax B1st
• IBM CMW
• MULTICS
• Scomp
• Trusted Xenix
   

• NSA - Historical List of Evaluated Products Some of these are TOS.

• NSA - Evaluated Products List Indexed by Rating

If you have any information that you would like added to this page, please use our Contact Us section.