40+ Operating systems written in C programming !!

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DG/UX
DDC-l
OpenVMS
Ultrix
HP-UX
Enea OSE
Google Chrome OS
Android
HP-UX 11i
z/OS



AIX (Advanced Interactive Exective)
OpenSolaris
OS/2
IBM Academic Operating System
ICL VME (Virtual Machine Entertainment)
MicroC/OS-III
WindowsNT
Windows CE
Singularity Operating System
RTXC Quadros
OS-9
Solaris
UNIX
Minix
BSD Unix
Darwin
Linux



OpenIndiana
ReactOS
Inferno
MorphOS
EmuTOS
iOS
Maemo
Windows Phone
iPoadLinux
Rockbox
eCos
ThreadX
Unix
AmigaOS