# Zeal-Operating-System/ZealOS

The Zeal Operating System is a modernized fork of the 64-bit Temple Operating System, TempleOS.

Repository: https://github.com/Zeal-Operating-System/ZealOS
Canonical: https://ross.abutalabs.com/products/zealos
Homepage: https://zealos.net
Language: HolyC
License: Unlicense
License Family: permissive
Topics: templeos, holyc, terry-davis, zenithos, zealos, public-domain, operating-system
Last push: 2026-07-31T14:49:25+00:00

## Health v2 (maintenance only)
Score: 71/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 95, release rhythm 24, longevity 100
- inputs: {"age_days": 1890, "days_push": 33, "days_rel": 296, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2376, forks 117 (observed 2026-08-28T04:06:42.076225+00:00)

## What it is
ZealOS is a modernized fork of the 64-bit TempleOS, a public-domain hobbyist operating system written in HolyC (renamed ZealC). It aims to be simple, fully documented, and comprehensible by a single person, with active work on VBE graphics, AHCI, networking, and UEFI booting.

## Use cases
- run a simple open-source operating system in a VM
- study how an entire OS works from boot to shell
- experiment with a C-like language (HolyC/ZealC) at the OS level
- fork or contribute to a public-domain operating system
- explore TempleOS's design with modern improvements like 60 FPS and variable resolutions
- boot a minimal OS on bare metal or via UEFI with Limine

## When to choose
- you want a small, fully readable, public-domain OS for learning or tinkering
- you are interested in TempleOS's philosophy but want modernized code, docs, and graphics
- you want to hack on kernel, drivers, or a JIT-compiled shell language in a self-contained system

## When to avoid
- you need a production OS with security, multitasking hardening, or broad hardware support
- you need networking or modern drivers as stable, complete features (still in development)
- you want a general-purpose desktop or server operating system

## Facets
- artifact type: application
- maturity: active
- function: interpreter, compiler, graphics
- domain: operating-systems, developer-tools, education
- platform: windows, cross-platform
- tags: templeos, holyc, zealc, public-domain, bare-metal, x86-64, retro-computing, virtualization, operating-system, linux, macos

## Member repositories
- Zeal-Operating-System/ZealOS (main) score 71

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:42.076225+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 2026-08-30T02:34:58.917834+00:00, confidence not recorded.
  - readme: https://github.com/Zeal-Operating-System/ZealOS (fetched 2026-08-28T04:06:42.076225+00:00, sha 22be8e61f431)
  - homepage: https://zealos.net (fetched 2026-08-29T10:15:52.617918+00:00, sha a6c31b12fe4e)
- Data as of 2026-08-30T08:39:29.467469+00:00.