VirtualBox is an Emulator
VirtualBox is a hosted hypervisor for x86 computers. It supports the
creation and management of guest virtual machines running versions
and derivations of Windows, Linux, BSD, OS/2, Solaris, Haiku, OSx86
and others, and limited virtualization of macOS guests on Apple
hardware. VirtualBox is freely available as Open Source Software under
the terms of the GNU Public License (GPL).
There is no official package available for openSUSE Leap 15.4