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Top 23 C O Projects
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Project mention: Tell HN: First commit on Linux Kernel GitHub Page is from 30th of April 2005 | news.ycombinator.com | 2026-05-27
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unikraft
A next-generation cloud native kernel designed to unlock best-in-class performance, security primitives and efficiency savings.
I've been using unikraft (https://unikraft.org/) unikernels for a while and the startup times are quite impressive (easily sub-second for our Rust application).
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illumos-gate
An open-source Unix operating system -- this is a read-only mirror of the official repository at https://code.illumos.org/plugins/gitiles/illumos-gate
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uC-OS3
µC/OS-III is a preemptive, highly portable, and scalable real-time kernel. Designed for ease of use on a huge number of CPU architectures.
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MuditaOS
Mobile operating system based on FreeRTOSâ„¢ optimized for E Ink displays - developed for Mudita Pure minimalist phone
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xboot
The extensible bootloader for embedded system with application engine, write once, run everywhere.
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RetrOS-32
A x86 32bit Hobby Operatingsystem with graphics, multitasking, networking and 32bit C-Compiler for i386 architecture.
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cavOS
💾 Amd64 operating system in C. Trying to make a full OS, with a simple and readable codebase!
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MollenOS
MollenOS/Vali is a modern operating system that is built with focus on abstraction and a modular design, allowing anyone to port it to any architecture. It currently targets the x86-32 and x86-64 platform.
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QuarkTS
An open-source OS for embedded applications that supports prioritized cooperative scheduling, time control, inter-task communications primitives, hierarchical state machines and CoRoutines.
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C Os discussion
C Os related posts
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Tell HN: First commit on Linux Kernel GitHub Page is from 30th of April 2005
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OpenBSD 7.9 Released
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The mdadm backup file: when it's needed, and when it isn't
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ReactOS
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Dirtyfrag: Universal Linux LPE
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Math Is Hard
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AI assistance when contributing to the Linux kernel
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A note from our sponsor - SaaSHub
www.saashub.com | 6 Jun 2026
Index
What are some of the best open-source O projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | linux | 235,340 |
| 2 | reactos | 17,574 |
| 3 | RIOT | 5,727 |
| 4 | seL4 | 5,518 |
| 5 | unikraft | 3,668 |
| 6 | illumos-gate | 1,874 |
| 7 | embox | 1,561 |
| 8 | llama2.c | 1,526 |
| 9 | uC-OS3 | 1,060 |
| 10 | winix | 949 |
| 11 | MuditaOS | 929 |
| 12 | xboot | 905 |
| 13 | RetrOS-32 | 814 |
| 14 | cavOS | 686 |
| 15 | opuntiaOS | 669 |
| 16 | Fiwix | 657 |
| 17 | t2sde | 643 |
| 18 | ghost | 643 |
| 19 | MollenOS | 453 |
| 20 | NeptuneOS | 438 |
| 21 | HeliOS | 411 |
| 22 | mos | 391 |
| 23 | QuarkTS | 345 |
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