• Linux
• BSD
• macOS

History, evolution

• The New Stack / Ken Thompson Recalls Unix's Rowdy, Lock-Picking Origins
  • Хабр / Кен Томпсон о взломе замков и рождении Unix

misc.

• sirredbeard/awesome-unix All the UNIX and UNIX-Like: Linux, BSD, macOS, Illumos, 9front, and more.