Whonix (formerly called TorBOX or AOS) is a general-purpose operating system based on Virtual Box, Debian GNU / Linux, and Tor.
The most interesting feature of course is that with this operating system you are completely anonymous when you go out on the internet.
Whonix design does not allow leaks of IP and DNS you use. Not even with malware with root privileges can someone learn the actual user's location.
This is because Whonix consists of two (virtual) machines. A machine
only Tor runs and acts as a gateway, which the system calls Whomnix-Gateway.
The other machine, referred to as the Whowniest-Workstation, is one
completely isolated network that only lets connections through Tor.
Download Whonix virtual machine images
The default user is: user
The default password is: changeme