AmigaOSW
AmigaOS
AROS Research Operating SystemW
AROS Research Operating System
ExokernelW
Exokernel
FreeRTOSW
FreeRTOS
GNU HurdW
GNU Hurd
Green Hills SoftwareW
Green Hills Software
HelenOSW
HelenOS
Mac OS 8W
Mac OS 8
Meiko ScientificW
Meiko Scientific
MicroEmpixW
MicroEmpix
MicrokernelW
Microkernel
MINIXW
MINIX
MINIX 3W
MINIX 3
OS2000W
OS2000
Phantom OSW
Phantom OS
PikeOSW
PikeOS
PowerUP (accelerator)W
PowerUP (accelerator)
QNXW
QNX
RIOT (operating system)W
RIOT (operating system)
SharpOSW
SharpOS
Singularity (operating system)W
Singularity (operating system)
SymbianW
Symbian