Hardened OS, LLC will focus on various levels of operating system assurance much like Common Criteria EAL 1-7. EAL or Evaluation Assurance Levels are not new but the application of these in a commercial venture is. The intent of the higher levels is to provide higher confidence that the system’s principal security features are reliably implemented. The new commercial venture takes the same concept and applies it to commercial available operating systems of every type, Windows-Linux-Unix-Mainframe-Mid range-OS X-Novell, non-inclusively.”]
Source: https://www.csoonline.com/article/2136283/be-a-hardoss-.html