The Six-Shooters & Spaceships sourcebook for the Serenity RPG provides plenty of what a body needs to stay alive in Joss Whedon’s space western universe: weapons, equipment and spaceships. My review of the book is up on GameCryer.com.

It's not an essential book, but it is a useful one as it introduces a variety of low and high tech items (livestock, new guns, cybernetics) as well as a ship floor plans and write-ups. There are also crew bios and statblocks for each ship, which are perfect as NPCs or heroes for a one-shot. While I run Serenity infrequently, I am planning on using the ship floor plans for my Star Wars: Shadows of the Force campaign.