Ghetto user mode emulation of Windows kernel drivers. See the Kernel driver unpacking blog post for a practical application.
You can use MakeUsermode to convert the driver to a user-mode program, it will then import the fake ntoskrnl.exe which acts as an emulator. It is meant as a way to conduct simple research and only a few APIs are implemented. A more comprehensive tool is speakeasy, but this allows you to debug drivers in x64dbg.
Related utility: SysShellHandler.