Portable-VirtualBox is a free and open source software tool that lets you run any operating system from a usb stick without separate installation. Developed by Runar Buvik
License: Open Source
Portable VirtualBox offers a lightweight, portable solution for virtualization, ideal for testing and development, while Virtual PC is more integrated into Windows, making it suitable for running legacy applications. The choice between them largely depends on the user’s need for portability versus integration with Windows.