WApache Mynewt
WAutomotive Grade Linux
WBlackBerry 10
WContiki
WCosmos (operating system)
WAtari Portfolio
WDOS Plus
WDR-DOS
WFreeDOS
WFreeRTOS
WGoogle Fuchsia
WHome Assistant
WInferno (operating system)
WJunos OS
WMagic Cap
WNokia Asha platform
WOpenComRTOS
WOS2000
WPalm OS
WDR-DOS
WPhoenix-RTOS
WPikeOS
WPlan 9 from Bell Labs
WQNX
WQP (framework)
WRIOT (operating system)
WRockbox
WRodos (operating system)
WDatalight
WRTEMS
WRTX (operating system)
WSeries 30
WSeries 30+
WSymbian Foundation
WSymbian
WTinyOS
WFM Towns
WΜClinux
WVxWorks
WWindows Embedded Industry
WWindows IoT
WZephyr (operating system)