List of free, open source operating systems

Updated: December 4, 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. vekos
  23. Essence
  24. Barrelfish
  25. ToaruOS
  26. Mezzano
  27. House
  28. Minoca OS
  29. Kerla
  30. SOS
  31. PowerNex
  32. Interim OS
  33. KolibriOS
  34. MINIX
  35. RISC OS
  36. HelenOS
  37. GeckOS/A65 V2.0
  38. Serenity
  39. GNU Hurd
  40. Plan 9
  41. Harvey
  42. illumos
  43. AquilaOS
  44. NuttX
  45. Sculpt
  46. Biscuit
  47. Xv6