1. vmplayer
download: https://my.vmware.com/web/vmware/free#desktop_end_user_computing/vmware_player/7_0
2. virtualbox
download: https://www.virtualbox.org/
3. debian (unix os)
net installation: https://www.debian.org/distrib/netinst
debian-8.1.0-amd64-netinst.iso
debian-8.1.0-i386-netinst.iso