A general purpose open source kernel and operating system with a special interest for music production and multimedia applications.

It's released under GPLv3, check it out at https://www.opensource.org/licenses/gpl-3.0

Get more information at https://tofus.morpheu5.net

You should only need to check that the configuration meets your testing environment and run make. If all goes well, a file called tofus should appear right there. You can copy it wherever you like and add it to your multiboot-compliant bootloader. I like GNU GRUB, hence here's the relevant entry:

title tOfuS
root (hdX,Y)          # read GRUB's manual, it's not that hard :-)
kernel /path/to/tofus

If you're testing tOfuS with QEMU (or other similar tools) you may need to reinstall GRUB every time you update the kernel image--as far as I can tell, something is getting cached and you need to flush it.