Flux-Fluke-Flask 1
Mach 40
AtheOS 13
BeOS 41
ChorusOS 5
Darwin 9
GNU Hurd 18
Mac OS X 67
MINIX 15
NeXT 15
QNX 18
Syllable 10
VSTa 1
| | Object-Oriented - Operating Systems, Software, Computers 91
POSIX - Operating Systems, Software, Computers 2
Submicrokernel - Operating Systems, Software, Computers 13
 NovaNova
 Effort to create a POSIX-like operating system atop the rtmk microkernel. [Open Source, GPL]
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OS/COS/C
 Small Unix-like microkernel OS, process- and file-oriented, most of the system is built around the scheduler; designed to use minimum system resources to provide network services and utilities; written in C; source browsing and downloads available. [Open Source, GPL]
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QuantixQuantix
 A POSIX microkernel with roots of the Mach and FreeBSD projects. [Open source, BSD-like]
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