# nifanfa/MOOS

C# x64 operating system programming with the .NET native ahead-of-time compilation technology.

Repository: https://github.com/nifanfa/MOOS
Canonical: https://ross.abutalabs.com/products/moos
Homepage: https://github.com/nifanfa/MOOS/wiki
Language: C#
License: Unlicense
License Family: permissive
Topics: csharp, operating-system, nativeaot, corert, hobby-os, os, multithreading, smp
Archived: true
Last push: 2026-08-25T02:58:20+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 1704, "days_push": 8, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1094, forks 91 (observed 2026-08-28T04:03:33.988154+00:00)

## What it is
MOOS is a hobby x64 operating system written in C# using .NET Native AOT compilation. It supports multithreading, SMP, USB, networking, and can run applications like DOOM, but is deprecated in favor of BootTo.NET.

## Use cases
- write an operating system in C#
- run C# code on bare metal
- learn OS development with .NET NativeAOT
- boot a managed-code kernel on x64 hardware
- experiment with multithreading and SMP in a hobby OS

## When to choose
- you want to study or fork a C# bare-metal OS
- you're interested in NativeAOT/CoreRT compiled kernels

## When to avoid
- you need a production or stable operating system
- you want active development - the project is archived and deprecated in favor of BootTo.NET
- you need IPv6, USB hubs, or exception handling

## Facets
- artifact type: application
- maturity: abandoned
- function: compiler, programming-language, concurrency, networking
- domain: operating-systems, developer-tools, embedded-systems
- platform: windows, dotnet
- tags: hobby-os, nativeaot, bare-metal, csharp-os, kernel, deprecated, x64, qemu

## Member repositories
- nifanfa/MOOS (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:33.988154+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 2026-08-30T06:47:37.855985+00:00, confidence not recorded.
  - readme: https://github.com/nifanfa/MOOS (fetched 2026-08-28T04:03:33.988154+00:00, sha b9df504b1b4d)
  - homepage: https://github.com/nifanfa/MOOS/wiki (fetched 2026-08-29T12:50:30.648544+00:00, sha f90b468ce323)
- Data as of 2026-08-30T08:39:29.467469+00:00.