Real-Time Operating Systems

Ardence RTX
BeRTOS
ChibiOS/RT
ChorusOS
CMX RTOS
Contiki
DNIX
DrRtos
DSP RTOS
DSOS
eCos
embOS
EROS
FreeRTOS
Fusion RTOS
Helium
HP-1000/RTE
INTEGRITY
LynxOS
MaRTE OS
MenuetOS
MERT
MicroC/OS-II
Multiuser DOS
Nano-RK
Neutrino
Nucleus RTOS
NuttX RTOS
Open AT OS
OSE
OS-9
OSEK
Phar Lap ETS
PaulOS
PICOS18
Phoenix-RTOS
PikeOS
Prex
pSOS
QNX
RMX
RSX-11
RT-11
RTAI
RTEMS
RTLinux
Salvo
SHaRK
SimpleAVROS
SINTRAN III
Symbian OS
Talon DSP RTOS
THEOS
ThreadX
Trampoline Operating System
Transaction Processing Facility
TRON Project
TUD:OS
UNIX-RTR
VRTX
VxWorks
Windows CE
Xenomai
µnOS