Whonix is a desktop operating system designed for advanced security and privacy. Whonix mitigates the threat of common attack vectors while maintaining usability. Online anonymity is realized via fail-safe, automatic, and desktop-wide use of the Tor network. A heavily reconfigured Debian base is run inside multiple virtual machines, providing a substantial layer of protection from malware and IP address leaks. Commonly used applications are pre-installed and safely pre-configured for immediate use. The user is not jeopardized by installing additional applications or personalizing the desktop. Whonix is under active development and is the only operating system designed to be run inside a VM and paired with Tor.
Based on Tor
Whonix utilizes Tor's free software, which provides an open and distributed relay network to defend against network surveillance.
Isolation
Connections through Tor are enforced. DNS leaks are impossible, and even malware with root privileges cannot discover the user's real IP address.
Compatibility
Whonix is available for all major operating systems. Most commonly used applications are compatible with the Whonix design.
cpfotiadis added Whonix as alternative to RebeccaBlackOS
Comments and Reviews
Whonix can really help you if you're not capable to use something like Qubes, it also runs in a VM, so you don't have to sacrifice your preferred OS for security (Although, since it's a VM, it WILL lag.)
Routes all connections over tor and the use of virtualization reduces attack surface