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 …

367 visits May 1, 2024 Details

Gemini Nucleus

gemini.sourceforge.net

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

487 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…

440 visits Apr 15, 2024 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, …

124 visits May 29, 2024 Details

Moo32

geocities.com

Early development microkernel.

166 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…

314 visits May 1, 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, …

175 visits Aug 15, 2024 Details

ReactOS

reactos.com

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

446 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 …

349 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…

156 visits Apr 14, 2026 Details

Open Source

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