List of free, open source operating systems

Updated: October 24, 2024

  1. OpenBSD
  2. Linux
  3. FreeBSD
  4. NetBSD
  5. Dragonfly BSD
  6. Qubes OS
  7. Haiku
  8. Redox
  9. ReactOS
  10. AROS
  11. FreeDOS
  12. BASIC-DOS
  13. Blog series: Writing an OS in Rust
  14. skiftOS
  15. Tock
  16. Hubris
  17. Essence
  18. Subgraph OS
  19. Ares
  20. osv.io
  21. axle OS
  22. Essence
  23. Barrelfish
  24. ToaruOS
  25. Mezzano
  26. House
  27. Minoca OS
  28. Kerla
  29. SOS
  30. PowerNex
  31. Interim OS
  32. KolibriOS
  33. MINIX
  34. RISC OS
  35. HelenOS
  36. GeckOS/A65 V2.0
  37. Serenity
  38. GNU Hurd
  39. Plan 9
  40. Harvey
  41. illumos
  42. AquilaOS
  43. NuttX
  44. Sculpt
  45. Biscuit
  46. Xv6