# HelenOS/helenos

A portable microkernel-based multiserver operating system written from scratch.

Repository: https://github.com/HelenOS/helenos
Canonical: https://ross.abutalabs.com/products/helenos
Homepage: https://www.helenos.org
Language: C
License Family: other
Topics: microkernel, drivers, multiserver, components, kernel, gui, tcp-ip, usb, multicore, helenos, sound, operating-system
Last push: 2026-08-24T14:45:33+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 3247, "days_push": 9, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1583, forks 160 (observed 2026-08-28T04:05:07.202449+00:00)

## What it is
HelenOS is a portable microkernel-based multiserver operating system written from scratch in C, decomposing OS functionality like file systems, networking, drivers, and GUI into fine-grained user space components communicating via message passing. It runs on eight processor architectures, from embedded ARM devices to multicore 64-bit servers, and is licensed under BSD.

## Use cases
- study a microkernel-based operating system design
- run a modular fault-tolerant OS in QEMU
- research message-passing OS architectures
- develop an operating system for embedded ARM devices
- explore multiserver OS component isolation
- learn operating system internals from clean source code

## When to choose
- you want to study or contribute to a clean, from-scratch microkernel OS design
- you need a research or educational OS with strong component isolation
- you want an OS that runs on many architectures including embedded ARM and SPARC
- you prefer BSD-licensed open source software

## When to avoid
- you need a production OS with Linux application compatibility
- you rely on legacy POSIX APIs or existing software ecosystems
- you need mature hardware driver support for modern devices
- you want a turnkey desktop or server operating system

## Facets
- artifact type: application
- maturity: active
- function: gui, networking, file-system, concurrency
- domain: operating-systems, embedded-systems, developer-tools
- platform: cross-platform, cpp, c
- tags: microkernel, multiserver, operating-system, message-passing, research-os, bsd-license, portable, operating-systems, arm

## Member repositories
- HelenOS/helenos (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:07.202449+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:55:59.643791+00:00, confidence not recorded.
  - readme: https://github.com/HelenOS/helenos (fetched 2026-08-28T04:05:07.202449+00:00, sha 7f333157bda8)
  - homepage: https://www.helenos.org (fetched 2026-08-29T11:26:34.503278+00:00, sha d4bb9ac99493)
  - site_page: https://www.helenos.org/wiki/About (fetched 2026-08-29T11:26:34.513061+00:00, sha d4bb9ac99493)
  - site_page: https://www.helenos.org/wiki/About?action=history (fetched 2026-08-29T11:26:34.515156+00:00, sha 6c8b64145b2d)
  - site_page: https://www.helenos.org/wiki/UsersGuide/QuickStart (fetched 2026-08-29T11:26:34.518978+00:00, sha df94419e6925)
  - site_page: https://www.helenos.org/wiki/About?action=diff&version=69 (fetched 2026-08-29T11:26:34.534343+00:00, sha eeba038e4fed)
  - site_page: https://www.helenos.org/about (fetched 2026-08-29T11:26:34.538188+00:00, sha 547c4dfc2337)
- Data as of 2026-08-30T08:39:29.467469+00:00.