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Top 23 C operating-system Projects
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ravynos
An open-source OS project that aims to provide source and binary compatibility with macOS® and a similar user experience.
Project mention: New OS aims to provide (some) compatibility with macOS | news.ycombinator.com | 2025-11-20 -
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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egos-2000
Envision a future where everyone can read all the code of an educational operating system.
Project mention: Line educational operating system released by Cornell University | news.ycombinator.com | 2026-05-12 -
PureDarwin
Darwin is the Open Source core of macOS, and PureDarwin is a community project to extend Darwin into a complete, usable operating system.
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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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Project mention: Open, free, and ignored: the afterlife of Symbian | news.ycombinator.com | 2025-07-17
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brutal
🏢 An operating system inspired by brutalist design that combines the ideals of UNIX from the 1970s with modern technology and engineering
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xboot
The extensible bootloader for embedded system with application engine, write once, run everywhere.
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Project mention: Show HN: Munal OS: a graphical experimental OS with WASM sandboxing | news.ycombinator.com | 2025-06-09
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 operating-system discussion
C operating-system related posts
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ReactOS
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Line educational operating system released by Cornell University
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Copy Fail – CVE-2026-31431
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Windows 11 Notepad to support Markdown
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30 Years of ReactOS
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illumos
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Loss32: Let's Build a Win32/Linux
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A note from our sponsor - SaaSHub
www.saashub.com | 9 Jun 2026
Index
What are some of the best open-source operating-system projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | reactos | 17,604 |
| 2 | raspberry-pi-os | 13,782 |
| 3 | ravynos | 6,720 |
| 4 | unikraft | 3,668 |
| 5 | lk | 3,642 |
| 6 | egos-2000 | 2,925 |
| 7 | PureDarwin | 2,615 |
| 8 | illumos-gate | 1,874 |
| 9 | helenos | 1,562 |
| 10 | brutal | 1,104 |
| 11 | jsos | 1,038 |
| 12 | winix | 949 |
| 13 | phantomuserland | 934 |
| 14 | xboot | 905 |
| 15 | cavOS | 688 |
| 16 | opuntiaOS | 669 |
| 17 | Fiwix | 657 |
| 18 | ghost | 643 |
| 19 | Polaris | 595 |
| 20 | ponyos | 554 |
| 21 | DreamShell | 547 |
| 22 | MellOs | 451 |
| 23 | node9 | 418 |
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