Whonix is a Debian-family Linux distribution based on Debian Stable. Split-virtual-machine architecture designed for bulletproof online anonymity and anti-fingerprinting.
Strengths: Workstation malware cannot leak your real IP even with root access; Gateway handles Tor routing entirely in isolated VM; DNS leaks are technically impossible by architecture. Trade-offs: Runs as virtual machines inside host OS or Qubes; High RAM requirement to run both VMs simultaneously.