The best open source alternative to Windows Sandbox is VirtualBox. If that doesn't suit you, our users have ranked more than 50 alternatives to Windows Sandbox and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Windows Sandbox are WinBoat, QEMU, Sandboxie Plus and KVM (Kernel-based Virtual Machine).
Open source VirtualBox offers powerful x86/AMD64 virtualization available freely under GNU GPL v2. Runs on Windows, Linux, Mac, Solaris hosts. Supports a vast array of guest OS like Windows, Linux, Solaris. Portable, lightweight, ad-free, with dark mode.
Runs Windows applications, individual apps, or full desktops inside Linux with native OS-level integration, sleek interface, advanced filesystem sharing, smartcard passthrough, and resource monitoring while supporting simple installation and ongoing feature updates.
QEMU, an open-source hypervisor, performs hardware virtualization, emulates CPUs using dynamic binary translation, and supports various architectures. It runs diverse unmodified guest OS, provides device models, and offers mixed translation modes for efficient execution.
Sandboxie Plus creates a sandbox-like isolated operating environment in which applications can be run or installed without permanently modifying the local or mapped drive.
KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.
Comprehensive desktop tool for managing virtual machines using libvirt, supporting KVM, Xen, and Linux Containers. It offers performance stats, resource allocation and virtual hardware configuration with VNC and SPICE clients for graphical consoles.
UTM is a full featured system emulator and virtual machine host for iOS and macOS. It is based off of QEMU. In short, it allows you to run Windows, Linux, and more on your Mac, iPhone, and iPad.
A simple GNOME application to access virtual systems. It is based on a design from Jon McCann and Jakub Steiner.
Firejail is a SUID security sandbox program that reduces the risk of security breaches by restricting the running environment of untrusted applications using Linux namespaces and seccomp-bpf.
Xen.org, home of the Xen hypervisor, the powerful open source industry standard for virtualization. It is a native (bare-metal) hypervisor providing services that allow multiple computer operating systems to execute on the same computer hardware concurrently.
Cross-platform GUI virtual machine manager using QEMU as backend. Support Linux/BSD/Windows 8/10/11
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Windows Sandbox is a sandboxing tool, but VirtualBox is for virtual machines.