Here's a list of virtual machine softwares that you can use in base as your system
Current os:
VirtualBox is a free and open-source software for hypervisor and virtualization, developed by Oracle Corporation.
Avaible platforms:
VMware is a global leader in cloud infrastructure and digital workspace technology.
Avaible platforms:
Parallels Desktop is a virtualization software for macOS for run Windows and other OSes with a lot of interesting features and tools.
Avaible platforms:
QEMU is a free and open-source emulator and virtualizer that performs hardware virtualization.
Avaible platforms:
Hyper-V is a native hypervisor that creates virtual machines on x86-64 systems running Windows.
Avaible platforms:
UTM is a free and open-source virtualization and emulation software for macOS and iOS based on QEMU.
Avaible platforms:
To virtualize or emulate macOS 9, you can use SheepShaver or QEMU. These emulators allow you to run classic Mac OS applications on modern hardware.
To virtualize or emulate macOS 8, you can use Basilisk II. This emulator allows you to run classic Mac OS applications on modern hardware.