List of free, open source operating systems

Updated: July 7, 2018

  1. OpenBSD
  2. Linux
  3. FreeBSD
  4. NetBSD
  5. Dragonfly BSD
  6. Qubes OS
  7. Haiku
  8. ReactOS
  9. AROS
  10. FreeDOS
  11. Redox
  12. osv.io
  13. ToaruOS
  14. House
  15. Minoca OS
  16. SOS
  17. PowerNex
  18. Ghost
  19. Interim OS
  20. KolibriOS
  21. MINIX
  22. HelenOS
  23. GNU Hurd
  24. Plan 9
  25. illumos
  26. AquilaOS
  27. Sculpt