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40+ Operating systems written in C programming !! DDC-l DG/UXOpenVMS 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 Mint (Mint is now Tos)

Year Event 1957 Bell Labs found they needed an operating system for their computer center that at the time was running various batch jobs. The BESYS operating system was created at Bell Labs to deal with these needs. 1965 Bell Labs was adopting third generation computer equipment and decided to join forces with General Electric and MIT to create Multics (Multiplexed Information and Computing Service). 1969 By April 1969,  AT&T  made a decision to withdraw Multics and go with GECOS. When Multics was withdrawn Ken Thompson and Dennis Ritchie needed to rewrite an operating system in order to play space travel on another smaller machine (a DEC PDP-7 [Programmed Data Processor 4K memory for user programs). The result was a system that a punning colleague called UNICS (UNiplexed Information and Computing Service)--an 'emasculated Multics'. 1969 Summer 1969 Unix was developed. 1969 L...