reactos/reactos
A free Windows-compatible Operating System observed · 2026-08-28
Health v2 · maintenance only
67/100
- Activity 99
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 3256
- days_rel: 530
- days_push: 7
- n_releases_24m: 1
Adoption not part of the score
17967 stars · 2191 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
ReactOS is a free, open-source operating system written from scratch that is binary-compatible with applications and drivers written for the Microsoft Windows NT family (NT4 through Windows 7 era). It is currently in Alpha quality and under heavy development, targeting Windows Server 2003 compatibility with an eye toward newer NT releases.
Use cases
- run Windows applications without a Windows license
- run Windows drivers on an open-source OS
- study operating system and kernel development
- test software in a Windows-compatible environment
- privacy-focused alternative to Windows telemetry
- contribute to an open-source Windows reimplementation
When to choose
- you need a free, open-source OS that can run Windows apps and drivers
- you want to learn or contribute to OS/kernel development
- you need a lightweight Windows-like environment for VMs or old hardware
- you care about privacy and want an OS with no telemetry
When to avoid
- you need a production-ready, stable daily-driver OS
- you require compatibility with modern Windows 10/11 software
- you cannot tolerate data corruption or frequent bugs
- you just need to run Windows apps occasionally - a VM with real Windows or Wine may be more practical
Facets
application · maturity experimental
security privacy operating-systems windows self-hosted privacy windows cross-platform osdev win32 windows-compatible kernel drivers open-source-os operating-system x86
3 sources
- readme: https://github.com/reactos/reactos · fetched 2026-08-28 · c1bcc046df0b
- homepage: https://reactos.org/ · fetched 2026-08-29 · 7d74fc0c3af3
- site_page: https://reactos.org/faq · fetched 2026-08-29 · 2ef379ae9fdc
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| reactos/reactos | main | 67 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem