Portable-VirtualBox7 is a free and open source software tool that lets you run any operating system from a USB stick without separate installation.
This version/fork uses the latest Testbuild version of VirtualBox.
Portable-VirtualBox7 v7.1.7 Testbuild 167994
More info is available on the original version at http://www.vbox.me/ running version: VirtualBox v7.0.20
Please see here for information on how to build from source: BUILDING.