SafeWalk is a tool kit designed for simulation of a safety-critical product line of astronaut jetpacks. It provides (1) a Unity-based simulation development environment and (2) software artifacts inspired by a real jetpack used by astronauts during spacewalks. SafeWalk has been developed to be a readily extensible and real-time configurable product line for use in research and education. It provides a rich environment conducive to empirical research into safety-critical requirements and to visualization of safety-related human-cyberphysical interactions. Tool Demo Video: https://iastate.box.com/v/SafeWalkToolDemo