Operating System Emulation
Discover the power of Portable Operating System Emulation, enabling you to run and test various OS environments from a USB drive or external storage without installation. Reviews on the best emulation software, enhancing your flexibility and security on the go.
VirtuaWin - Windows Virtual Desktop Manager

VirtuaWin is a free portable virtual desktop manager for Windows. Much like virtual desktop managers for Linux/Unix, it enables a user to easily organize multiple applications over several virtual desktops or workspaces. This helps eliminate clutter that normally builds up on singular desktops by giving extra workspace in the form of multiple desktops.
MobaLiveCD - Portable Live CD Emulator

MobaLiveCD is a Free Portable Live CD Emulator that utilizes a software front end for Qemu to enable you to (Run Linux on Windows). Run your Linux Live CDs and other ISO files portably from within Windows without rebooting. Moreover, all of this can be stored and run directly from a portable USB device.
Mac On a Stick - Portable Macintosh on a USB stick

Mac On a Stick aka: Mini vMac, just as the name imposes, is a portable Macintosh emulated operating system that can be booted and run from a USB flash drive. Although for most, it isn't a complete replacement operating system, a MOS installation can include many useful applications running from an emulated Mini vMac (a Macintosh Plus emulator).
Cameo BlackBox for Windows Shell

Cameo is a neat BlackBox for Window or (Windows Shell). Basically, it is an open source portable desktop environment that can be used in place of Windows Explorer. But it's more than just that. The full version includes many open source portable applications and tools that can be run from within. It is based on a modified bbLean shell, offering a more Linux like style, look and feel.
Emerge Desktop - Alternate Windows Shell

Emerge Desktop is an Open Source, portable Windows shell replacement that offers users an efficient and customizable alternative to the standard Windows Explorer shell. Designed with a modular architecture and powered by MinGW, it enables enhanced desktop control, resource efficiency, and advanced customization options for power users and developers alike.
Portable Qemu Manager

Portable QEMU Manager is a lightweight, portable utility for managing virtual machines with the QEMU emulator. This application simplifies the process of creating, configuring, and running virtual machines, making it an ideal tool for developers, IT professionals, and anyone looking to work with virtualized environments. Its straightforward graphical user interface (GUI) allows users to manage virtual machines and their resources quickly and efficiently.