You download all these operating system and more free, totally free, just that these are old operating system the manufacturer doesn’t support anymore, so it’s good to play around with or create a museum out of it 🙂
DOS & CP/M
86-DOS Concurrent CPM-86 Concurrent DOS CP/M 86 CP/M-80 DOS Plus DR-DOS MP/M MS-DOS Multitasking MS-DOS 4.00 Multiuser DOS PC-DOS PC-MOS PTS-DOS Real/32 Tandy Deskmate Wendin DOSWindows
BackOffice Server Windows 1.0 Windows 2.x Windows 2000 Windows 3.0 / 3.1 Windows 95 Windows 98 Windows Longhorn Windows ME Windows Nashville Windows Neptune Windows NT 3.x Windows NT 4.0 Windows Whistler WinFrameApple/Mac
A/UX Mac OS 7 Mac OS 8 Mac OS 9 Mac OS X System Software (0-6)OS/2
Citrix Multiuser OS/2 1.x OS/2 2.0 OS/2 3.x OS/2 Warp 4*nix
A/UX AIX AT&T System V Unix Banyan VINES Corel Linux DEC OSF-1 DELL Unix Digital UNIX FreeBSD Gentus Linux HP-UX IRIX Lindows Linux Kernel Mandrake Linux NEWS-OS NeXTStep PC/IX QNX Red Hat Linux Sun Solaris SunOS Tru64 UNIX Ubuntu Ultrix UnixWare Xandros Linux XenixOther OS and Shells
Atari DOS BeOS Breadbox Ensemble GEM GEOS/GeoWorks Inferno NetWare OS/400 Pick Operating System Plan 9 RISC OS SuperDOS Tandy Deskmate Thoroughbred/OS UCSD p-System Visi On VMS
winworldpc.com
https://winworldpc.com/library/operating-systems