QEMU is a really fast and fairly accurate emulator for various architectures. It is easier to test Fudge in QEMU than to install it on a real machine every time you make a change.
Building Fudge (x86).
$ qemu-system-x86 -kernel fudge -initrd fudge.cpio
Possible extra options that Fudge supports:
-serial stdio -vga std -net nic,model=rtl8139 -net tap,script=no,downscript=no,ifname=tap0