List of free, open source operating systems

Updated: January 27, 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. Snowdrop OS
  23. vekos
  24. Essence
  25. Barrelfish
  26. ToaruOS
  27. Mezzano
  28. House
  29. Minoca OS
  30. Kerla
  31. SOS
  32. PowerNex
  33. Interim OS
  34. KolibriOS
  35. MINIX
  36. RISC OS
  37. HelenOS
  38. GeckOS/A65 V2.0
  39. Serenity
  40. GNU Hurd
  41. Plan 9
  42. Harvey
  43. illumos
  44. AquilaOS
  45. NuttX
  46. Sculpt
  47. Biscuit
  48. Xv6