# nebulet/nebulet

A proof-of-concept microkernel that implements a WebAssembly "usermode" that runs in Ring 0.

Repository: https://github.com/nebulet/nebulet
Canonical: https://ross.abutalabs.com/products/nebulet
Language: Rust
License: MIT
License Family: permissive
Topics: osdev, webassembly, rust, operating-system, microkernel, nebulet
Archived: true
Last push: 2023-02-28T21:27:36+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3117, "days_push": 1282, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2355, forks 72 (observed 2026-08-28T04:06:40.603914+00:00)

## What it is
Nebulet is a proof-of-concept microkernel written in Rust that executes WebAssembly modules in Ring 0 within a single address space. It uses the Cranelift compiler to translate WebAssembly to native code, enabling low context-switch overhead and syscalls implemented as plain function calls.

## Use cases
- run webassembly modules as an operating system usermode
- research low-overhead syscall designs in a microkernel
- experiment with sandboxed wasm execution in ring 0
- study verified wasm memory isolation without bounds checks
- build an experimental rust-based operating system kernel

## When to choose
- you are researching novel OS designs that run wasm natively in kernel space
- you want a minimal microkernel codebase to study or extend in Rust
- you need a proof-of-concept for syscall-as-function-call performance ideas

## When to avoid
- you need a production-ready operating system or general-purpose kernel
- you want to run existing applications or drivers
- you expect active maintenance or stable releases

## Facets
- artifact type: application
- maturity: experimental
- function: interpreter, compiler, security
- domain: operating-systems, compilers, security
- platform: rust, windows
- tags: microkernel, webassembly, ring-0, osdev, cranelift, research, linux, macos

## Member repositories
- nebulet/nebulet (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:40.603914+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 2026-08-30T02:36:27.127583+00:00, confidence not recorded.
  - readme: https://github.com/nebulet/nebulet (fetched 2026-08-28T04:06:40.603914+00:00, sha a49181831467)
- Data as of 2026-08-30T08:39:29.467469+00:00.