Space Covers the creation of a space campaign, including solar system creation, and starship construction. Also has rules for variable gravity, alien atmospheres, and other hazards of space travel. There's also a very useful section to work out how physics and technology work in your campaign, and what are the ramifications of combining FTL travel, communications, anti-gravity, force fields, etc. Vehicles A very detailed construction system for vehicles of all tech levels. Also includes rules for construction of vehicular weaponry, which work nearly as well for designing hand-held guns and even medieval siege weapons.
Rules also cover vehicular combat and maneuvers.
See the Vehicles section for more detail. Includes rules for giant-robot sized melee weapons and transforming robots. Bestiary A book full of real world animals, with a few mythological beasts thrown in. It has a section for creating were-beasts as characters, although this may be moved to some other book after the third edition. Space Bestiary covers both exotic alien biospheres and hard vacuum dwelling critters.