Open Source

Apostle

apostle.sourceforge.net

Free microkernel operating system for i386 architecture, built on Gemini Nucleus, coded in C. Seeks to provide well-designed alternate to extant OSs; goal: create an OS that works …

366 visits May 1, 2024 Details

E.R.I.K.A.

erika.sssup.it

Microkernel RTOSs and set of integrated tools to develop embedded realtime applications, made to support all architectures used in power train controllers in automotive industry. K…

290 visits Mar 6, 2026 Details

Gemini Nucleus

gemini.sourceforge.net

Open source project to make a production quality micro kernel based on the latest findings in OS research.

486 visits Jul 20, 2024 Details

Haiku Project

haiku-os.org

(former OpenBeOS project) Goal: recreate (functional equivalent), and then extend, BeOS R5, with binary and source compatibility. Servers and APIs (kits) being rewritten from scrat…

439 visits Apr 15, 2024 Details

JTMOS

fortunecity.com

Operating system aimed at OS developers and users who are very advanced at using computers generally; microkernel, multitasking, multithreaded, some garbage collection. [Open Sourc…

108 visits Jun 23, 2025 Details

LinksOS

sourceforge.net

To be fast, secure, straightforward, fill gap between OS X, Linux, Windows, built on microkernel, coded in Assembly, C/C++; for desktops, workstations, small servers. Description, …

123 visits May 29, 2024 Details

Mika OS

mikaos.ifrance.com

Low-level coded, AI oriented microkernel OS, based on neural nets. Goal: provide a hight flexible OS architecture based on neural networks and sensor equipped devices. Mach4/Flux-b…

91 visits Apr 17, 2026 Details

Moo32

geocities.com

Early development microkernel.

165 visits Dec 15, 2025 Details

NewOS

newos.org

Loosely based on concepts in BeOS, FreeBSD, NT, Solaris, other modern OSs; goals: be as modern and complete as possible, emphasize platform portability; runs on x86 1, 2/4 SMP CPUs…

313 visits May 1, 2024 Details

OS/C

blake.prohosting.com

Small POSIX 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 u…

255 visits Jan 25, 2024 Details

Programmers Operating SYStem: POSYS

posysos.sourceforge.net

To be simple 32-bit multitasking microkernel using all security features of x86 processors, able to load and execute modules for: MS Win32 (32-bit PE, EXE; dynamic link libraries, …

174 visits Aug 15, 2024 Details

ReactOS

reactos.com

Opensource effort to develop a quality operating system compatible with Windows NT applications and drivers.

445 visits May 19, 2024 Details

rtmk

rtmk.sourceforge.net

Realtime microkernel: preemptive, fully re-entrant, multithreaded, SMP, continuations, full locking primitives; shares many ideas with Mach, developed by CMU in late 1980's, early …

348 visits Jan 16, 2025 Details

sMultiTA

dobit.com

World's smallest, but full functioning, software extension for MultiTAsking. Very small 200 lines, coded in C, simple, no interrupts or blocking, for hard realtime use; portable, e…

155 visits Apr 14, 2026 Details

Spoon Microkernel

djm.co.za

Hobby and education OS, for Intel compatible CPUs; simple, available source code make it a useful source of learning material. South Africa. Descriptions, documents, screenshots, t…

330 visits Aug 6, 2025 Details

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