The installation of Windows, Linux, or Mac operating system has been automated and foolproof for a long time, with no technical difficulty. But if you want to install and use multiple systems at the same time, whether it's a combination of multiple different versions of Windows or Windows + Linux + Mac (each has a different boot method), the hardest part is figuring out their installation order and adjusting the boot menu. This can be cumbersome and experience required even for advanced computer users.

Mednafen (short for My Emulator Doesn't Need A Frickin' Excellent Name, formerly known as Nintencer) is a free, open-source and multi-system video game console emulator for Windows, Mac and Linux platforms. It already emulates nearly 20 home and handheld game consoles from Atari to PS1 era, such as FC, MD, GB, GBA, PS, SS, PC-FX, etc.

OpenEmu (formerly called OpenNestopia) is a free and open-source multiple systems universal game console emulator only for Mac OS. Its appearance means that the 'It just works' concept has extended to the video game simulation field on Mac operating system for the first time ever. And its purpose is to bring macOS game emulation into the realm of first class citizenship.

YUMI (short for Your Universal Multiboot Installer) is the successor of MultibootISOs, a free, open-source, powerful and user-friendly USB installer maker. It is used to create multi-system bootable USB devices, which can boot multiple operating systems, antivirus programs, disk cloning tools, system diagnostic tools, and more.