OS Origins #

Where did Linux / Windows / macOS come from?

A concise overview of how modern operating systems evolved — from early UNIX systems to Linux distributions, Windows NT, macOS, Android, and Chrome OS.

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graph TB

%% ========= USAGE COLOR DEFINITIONS =========
classDef desktop fill:#E8EEF3,stroke:#777;
classDef server fill:#F3EFEA,stroke:#777;
classDef hybrid fill:#E9F1EC,stroke:#777;

%% ========= LEGEND =========
subgraph LEGEND["Legend"]
    direction TB
    D1[Desktop / User-facing]:::desktop
    D2[Server / Infrastructure]:::server
    D3[Hybrid usage]:::hybrid
    D4[Solid arrow → Direct code lineage]
    D5[Dashed arrow → Influence / POSIX / UNIX-like]
end

%% ========= EARLY SYSTEMS =========
subgraph EARLY["Early Systems"]
    direction TB
    CP[CP/M
1974
Gary Kildall]:::server
    DOS[MS-DOS
1981
Microsoft]:::desktop
    CP --> DOS
end

%% ========= UNIX ROOT =========
subgraph UNIX["UNIX Family"]
    direction TB
    U[UNIX
1969
Bell Labs]:::server
    BSD[BSD Unix
1977
Berkeley]:::server
    SYSV[System V
1983
AT&T]:::server
    U --> BSD
    U --> SYSV
end

%% ========= BSD DERIVATIVES =========
subgraph BSD_SYS["BSD-derived Systems"]
    direction TB
    DARWIN[Darwin / XNU
2000
Apple]:::hybrid
    MAC[macOS
2001]:::desktop
    IOS[iOS / iPadOS
2007]:::desktop
    BSDOS[FreeBSD / OpenBSD / NetBSD
1993–1996]:::server
    BSD --> DARWIN
    DARWIN --> MAC
    DARWIN --> IOS
    BSD --> BSDOS
end

%% ========= CLASSIC MAC =========
CLASSIC[Classic Mac OS
1984
Apple]:::desktop
CLASSIC -.-> MAC

%% ========= MINIX =========
MINIX[MINIX
1987
Andrew S. Tanenbaum]:::server

%% ========= LINUX KERNEL =========
subgraph LINUX["Linux Kernel"]
    direction TB
    LINUXK[Linux Kernel
1991
Linus Torvalds]:::server
end

%% ========= LINUX DISTRIBUTIONS CALLOUT =========
subgraph LINUXDIST["Linux Distributions"]
    direction TB
    NOTE[Linux is a kernel.
Distributions combine it with
userland, package managers,
and policies.]:::hybrid
end
LINUXK --> NOTE

%% ========= EARLY LINUX DISTROS =========
subgraph EARLYDIST["Early Linux Distributions"]
    direction TB
    SLACK[Slackware
1993]:::server
    DEB[Debian
1993]:::server
    RH[Red Hat Linux
1994]:::server
    LINUXK --> SLACK
    LINUXK --> DEB
    LINUXK --> RH
end

%% ========= DEBIAN FAMILY =========
subgraph DEBFAM["Debian Family"]
    direction TB
    UB[Ubuntu
2004
Canonical]:::hybrid
    MINT[Linux Mint
2006]:::desktop
    KALI[Kali Linux
2013]:::server
    DEB --> UB
    UB --> MINT
    DEB --> KALI
end

%% ========= RED HAT FAMILY =========
subgraph RHF["Red Hat Family"]
    direction TB
    FED[Fedora
2003]:::hybrid
    RHEL[RHEL
2002]:::server
    CLONES[RHEL Clones
CentOS / Alma / Rocky
2004–2021]:::server
    RH --> FED --> RHEL --> CLONES
end

%% ========= INDEPENDENT DISTROS =========
subgraph INDEP["Independent Linux Distributions"]
    direction TB
    ARCH[Arch Linux
2002]:::hybrid
    GENTOO[Gentoo
2002]:::hybrid
    LINUXK --> ARCH
    LINUXK --> GENTOO
end

%% ========= MOBILE / SPECIALIZED =========
subgraph MOBILE["Mobile / Specialized Linux"]
    direction TB
    AND[Android
2008
Google]:::desktop
    CHROMIUM[Chromium OS
2009]:::hybrid
    CHROME[Chrome OS
2011]:::desktop
    LINUXK --> AND
    LINUXK --> CHROMIUM --> CHROME
end

%% ========= WINDOWS =========
subgraph WINDOWS["Windows NT Family"]
    direction TB
    NT[Windows NT
1993]:::server
    W2K[Windows 2000 / XP
2000–2001]:::hybrid
    W7[Windows 7
2009]:::hybrid
    W10[Windows 10 / 11
2015–2021]:::desktop
    NT --> W2K --> W7 --> W10
end

%% ========= INFLUENCE LINKS =========
U -.->|POSIX / UNIX concepts| LINUXK
MINIX -.->|UNIX-like| LINUXK
DOS --> NT

%% ========= SUBGRAPH STYLING =========
style UNIX fill:#FBF2EA,stroke:#B85C38,stroke-width:2.5px
style BSD_SYS fill:#EEF3F8,stroke:#4A6FA5,stroke-width:2.5px
style LINUX fill:#F6F1E7,stroke:#9C8A4D,stroke-width:2.5px
style EARLYDIST fill:#EDF4EF,stroke:#5C8A72,stroke-width:2px
style DEBFAM fill:#EAF3F1,stroke:#4F8F8B,stroke-width:2px
style RHF fill:#F4EEE9,stroke:#9A6B4F,stroke-width:2px
style INDEP fill:#F1F3F3,stroke:#6B7280,stroke-width:2px
style MOBILE fill:#FAF0EB,stroke:#C97C5D,stroke-width:2px
style WINDOWS fill:#EEF2F7,stroke:#3A5F8C,stroke-width:2.5px
style EARLY fill:#F4F4F2,stroke:#7A7A7A,stroke-width:2px
style LEGEND fill:#F6F6F6,stroke:#999,stroke-width:1.8px
style LINUXDIST fill:#EDF2F7,stroke:#5A6F8E,stroke-width:2px