This document discusses the development of ATT&CK frameworks for macOS and Linux. It notes that these operating systems are increasingly important targets but have less reporting and visibility than Windows. The author leads the effort to create ATT&CK matrices for macOS and Linux techniques. They reviewed over 230 techniques in the first year and made over 50 updates. The document highlights differences in macOS and Linux and lessons learned about developing the frameworks through community involvement. It outlines the roadmap to complete macOS coverage in 2022 and Linux Enterprise coverage in late 2022.