savane.img.tar.gz
  Raw disk image.  Decompress it and run it with QEMU or other
  emulation/virtualization software (see savane-run.sh).
  Thanks to optimized sparse file support, it won't take 2GB, but only
  around 700MB on disk (check with 'du -sh').

savane.qcow2
  The disk image in QEMU QCOW2 format.  You can run it directly (no
  need to decompress it) but it may be slower.

savane.vmdk
savane.ovf
savane.mf
  The disk image in Open Virtualization Format.
  Download the .vmdk and the .ovf, and import the .ovf in VirtualBox.
  If the .mf is present, it will be used to checksum the files.

savane-run.sh
  Info on how to use the disk image.

bzImage
  The custom, basic Linux kernel bundled in the disk image.  It has
  support for some QEMU and VirtualBox virtual hardware.
  Once you're running the disk image, you may install Debian's kernel.