This is a virtual museum of operating systems (and standalone applications) running under emulation, implemented as a Linux VM for QEMU, VirtualBox, or UTM.

A custom emulator-independent launcher is provided, and all OSes and emulators are pre-installed and pre-configured. The launcher includes a snapshot feature to quickly revert broken installations back to a working state. Hypervisor installers and shortcuts to run the VM on Windows, macOS, and Linux are also included.

Announced on the COFF mailing list https://www.tuhs.org/pipermail/coff/2026-May/002313.html