A fantastic adaptation of the great Barbarians of Lemuria system to post-apocalypse settings. Other reviewers have gone fairly in-depth already, but I want to add that this book can easily be used to do almost any science fiction genre out there. Since it covers such a wide range of PA possibilities, it includes rules for aliens, robots, high-tech weapons and armor, cybernetics, vehicles (including, yes, spaceships). It is far more versatile than the title implies.

If you like BoL, this book is a must-have in my opinion.