Free OSes

A number of manufacturers and groups provide OSes for free individual use, or in some cases, unrestricted use! Like anything that’s free, don’t expect printed manuals, CD-ROMs, or free technical support. Other than that, there are few, if any strings attached. Also note that with the size of most OSes, downloads of 1 to 10 GB of data may not be that exciting, so paying for the DVD/CD-ROM or even a low-cost base package may be well worth it to you.

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FreeDOS
An independently developed DOS, with source code

RxDOS
An independently developed DOS, with source code

Android
Android x86 download page

Debian Linux
Linux download FTP sites

Fedora Linux
Red Hat’s free Linux

Koppix CD Linux
Linux that runs directly from CD

PCLinuxOS
PCLinuxOS download page

Red Hat Linux
Red Hat’s download page

Slackware Linux
Download from HTTP or FTP

SUSE Linux
Download SUSE Linux

Ubuntu Linux
Download Ubuntu Linux

Darwin
Download (requires agreement acceptance, etc.)

Free BSC
Free Unix OS

NetBSD
Free Unix OS, supported on many CPU platforms

OpenBSD
Free Unix OS, supported on many CPU platforms

Solaris
Free download

AROS
Free, source code available

ReactOS
Free Windows compatible OS

SkyOS
GUI OS (in beta, was free, but now charging $30)

Visopsys
Free, source code available