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Damn Small Linux is a very versatile 50MB mini desktop oriented Linux distribution.
http://www.damnsmalllinux.org

Ubuntu Linux : http://www.ubuntu.com

https://lubuntu.me/
Lubuntu is a complete Operating System that ships the essential apps and services for daily use: office applications, PDF reader,  image editor, music and video players, etc. It is light and fast, especially for old computers (version 14.04 can be burnt bootable on a CD-R)

https://www.winehq.org/
Wine (originally an acronym for “Wine Is Not an Emulator”) is a compatibility layer capable of running Windows applications on several POSIX-compliant operating systems, such as Linux, macOS, & BSD.
And it is fast.

Aurox (Fedora)

Microsoft Windows

Mandriva Linux

Cygwin emulates a Unix system under Windows
http://www.cygwin.com

VirtualBox is a free cross-platform virtualization application with an easy to use GUI :
http://www.virtualbox.org

QEMU is a GNU cross platform system emulator :
http://www.qemu.org

DOSBox is a cross platform MS-DOS emulator. It is compatible with most programs, especially for games :
http://www.dosbox.com

https://www.riscosopen.org
RISC OS is a computer operating system designed in Cambridge, England by Acorn. First released in 1987, its origins can be traced back to the original team that developed the Arm microprocessor. RISC OS is owned by RISC OS Developments Ltd. You can find out more at sites such as riscos.info, The Icon Bar and RISCOSitory.

https://bochs.sourceforge.io
bochs: The Open Source IA-32 Emulation Project (Home Page)
Bochs is a highly portable open source IA-32 (x86) PC emulator written in C++, that runs on most popular platforms. It includes emulation of the Intel x86 CPU, common I/O devices, and a custom BIOS.