The best open source alternative to Parallels Desktop is VirtualBox, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Parallels Desktop and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Parallels Desktop are Wine (Free, Open Source), QEMU (Free, Open Source), Proton (Free, Open Source) and virt-manager (Free, Open Source).
Wine is a free, open source application for running Windows software on operating systems that are normally not supported. With Wine, you can install and run these applications just like you would in Windows.
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Almost everyone thinks Wine is a great alternative to Parallels Desktop.
Portable-VirtualBox is a free and open source software tool that lets you run any operating system from a usb stick without separate installation. It unpacks and adjusts the paths and configuration of VirtualBox so it will run portably.
Darling — macOS translation layer for Linux Fast Darling runs macOS software directly without using a hardware emulator. Free Like Linux, Darling is free and open-source software. It is developed openly on GitHub and distributed under the GNU GPL license version 3.