Best Open-Source Virtual Machine Software 2026: 6 Options Compared

Virtual machine software runs from a desktop app for trying another operating system up to a data-centre platform running dozens of servers, and the open-source options map neatly onto that range. On a desktop, VirtualBox is the familiar choice for Windows, Linux and Intel Mac hosts; its base package is GPL, but the Extension Pack for USB 2 and 3 support has a separate licence free only for personal and educational use. UTM brings virtual machines to Macs, including Apple Silicon, using QEMU underneath with a friendly interface. QEMU itself is the engine many tools build on: powerful and scriptable, but you configure it with command-line options. For servers, Proxmox VE and XCP-ng are complete virtualisation platforms with web management, clustering and backups, while Incus manages system containers and virtual machines from one command-line tool. The trade-off is ease against flexibility. A graphical desktop tool gets you running in minutes but offers limited automation, whereas the server platforms need dedicated hardware and some administration knowledge. Choose by hardware: Apple Silicon Macs can only virtualise ARM guests at near-native speed, so check that the guest operating system you want has an ARM version before you start.

VirtualBox

GPL-3.0 base package for Windows, Linux and macOS. The Extension Pack is free only for personal and educational use, which matters if you run it at a company.

Price: Free (Extension Pack is free for personal and educational use only) (VirtualBox pricing, checked 2026-10-22).

Platforms and license: Windows, Linux, macOS. GPL-3.0 (base package); Extension Pack under PUEL (open source) (license source).

Project activity: 1.5k GitHub stars · last commit Oct 20, 2026

Best for: Desktop VMs on Intel and AMD machines.

Worth knowing: Commercial Extension Pack use needs an Oracle license.

Compare: VirtualBox alternatives

QEMU

GPL-2.0 emulator and virtualiser that runs on Linux, macOS and Windows and emulates many CPU types. Extremely flexible but command-line driven.

Price: Free (Open source under GPL-2.0; no paid plan) (QEMU pricing, checked 2026-10-23).

Platforms and license: Linux, macOS, Windows. GPL-2.0 (open source) (license source).

Project activity: 13.9k GitHub stars · last commit Oct 27, 2026

Best for: Scripting VMs and emulating other architectures.

Worth knowing: Open-source machine emulator and virtualizer; used on its own or with a GUI front end.

UTM

Apache-2.0 front end for QEMU and Apple virtualisation on macOS and iOS. The App Store copy costs money, but the direct download from the website is free.

Price: Free (free download from the website; App Store version is a paid convenience) (UTM pricing, checked 2026-10-22).

Platforms and license: macOS, iOS. Apache-2.0 (open source) (license source).

Project activity: 36.6k GitHub stars · latest release v5.0.8 (Oct 17, 2026) · last commit Oct 20, 2026

Best for: Mac and Apple Silicon users.

Proxmox VE

AGPL-3.0 server platform with web UI, clustering, backups and containers. The software is free; support subscriptions start at 120 EUR per CPU socket per year.

Price: Free (software is free; subscriptions add the enterprise repository and support); paid from EUR 120 per CPU socket/year (Community subscription) (Proxmox VE pricing, checked 2026-10-22).

Platforms and license: Self-hosted (bare metal). AGPL-3.0+ (open source) (license source).

Project activity: 108 GitHub stars · last commit Oct 23, 2026

Best for: Home labs and small business servers.

Worth knowing: Other tiers per socket per year: Basic EUR 370, Standard EUR 550, Premium EUR 1,100.

Compare: Proxmox VE alternatives

XCP-ng

GPL-2.0 Xen-based hypervisor installed on bare metal. Needs dedicated hardware, and its management web UI is a separate component.

Price: Free (XCP-ng pricing, checked 2026-10-22).

Platforms and license: Self-hosted (bare metal). GPL-2.0 (open source) (license source).

Project activity: 1.6k GitHub stars · latest release 8.3.0-20250606 (Jun 16, 2025) · last commit Oct 26, 2026

Best for: Replacing VMware ESXi on servers.

Incus

Apache-2.0 manager for system containers and virtual machines, driven from a command line on Linux. It has clients for Windows and macOS but no desktop VM window.

Price: Free (Free open source software) (Incus pricing, checked 2026-10-22).

Platforms and license: Linux, Client on Windows and macOS. Apache-2.0 (open source) (license source).

Project activity: 6.5k GitHub stars · latest release v7.0.2 (Oct 16, 2026) · last commit Oct 27, 2026

Best for: Linux admins who want containers and VMs together.

Worth knowing: Manages system containers, application containers and VMs from a CLI and REST API; the upstream site mentions no built-in web UI.

Which one to pick

• You want to try Linux on your laptop: VirtualBox
• You have an Apple Silicon Mac: UTM
• You are leaving VMware on your own servers: Proxmox VE
• You want to script VMs from the command line: QEMU