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Non-proprietary [ edit source  |  edit beta ] Unix-like [ edit source  |  edit beta ] Research Unix-like and other POSIX-compliant [ edit source  |  edit beta ] Minix  (study OS developed by  Andrew S. Tanenbaum  in the  Netherlands ) Plan 9  (distributed OS developed at  Bell Labs , based on original Unix design principles yet functionally different and going much further) Inferno  (distributed OS derived from  Plan 9 , originally from Bell Labs) Plan B (distributed OS derived from  Plan 9  and Off++ microkernel) Unix  (OS developed at Bell Labs ca 1970 initially by  Ken Thompson ) Xinu  (Study OS developed by  Douglas E. Comer  in the  USA ) Free and open source  Unix-like [ edit source  |  edit beta ] Ubuntu , an example of a Unix-like system BSD  (Berkeley Software Distribution, a variant of Unix for  DEC   VAX  ...

MontaVista Software [ edit source  |  edit beta ] MontaVista  Mobilinux NCR Corporation [ edit source  |  edit beta ] TMX  - Transaction Management eXecutive Novell [ edit source  |  edit beta ] NetWare  network operating system providing high-performance network services. Has been superseded by Open Enterprise Server line, which can be based on NetWare or Linux to provide the same set of services. Open Enterprise Server , the successor to NetWare. Quadros Systems [ edit source  |  edit beta ] RTXC Quadros  RTOS proprietary C-based RTOS used in embedded systems ows RCA [ edit source  |  edit beta ] TSOS , first OS supporting virtual addressing of the main storage and support for both timeshare and batch interface RoweBots [ edit source  |  edit beta ] DSPnano RTOS  8/16 Bit Ultra Tiny Embedded Linux Compatible RTOS Samsung Electronics [ edit source  |  edit bet...