I bought the huge 656-page Traveller 5th-edition book, but it has a lot of errata. Undeniably it is a complete system for running a game in a star-empire. There is no setting information in it, but people rely on the Third Imperium or other settings or time-periods from previous editions of TRAVELLER. If you want to download D6 Space, the science-fiction setting for the D6 System, you can easily do it on the Polgarus Games site. You can download the basic D6 SYSTEM rules, then D6 SPACE, D6 SPACE: ALIENS I, and D6 SPACE: SHIPS <a href="http://www.polgarusgames.com/download-page" rel="nofollow">http://www.polgarusgames.com/download-page</a> I have found a few other free "space opera" games with wild and weird ideas, all free (though you may have to register your e-mail and password on the site.) STARS WITHOUT NUMBER: <a href="http://rpg.drivethrustuff.com/product_info.php?pro" rel="nofollow">http://rpg.drivethrustuff.com/product_info.php?pro</a>... ICAR (a British RPG): <a href="http://www.icar.co.uk/" rel="nofollow">http://www.icar.co.uk/</a> There are just so many... And oh, STAR FRONTIERS is still my number-one fave RPG. The clear combat rules integrating vehicle combat AND aerial combat at the same time did it for me! KNIGHT HAWKS was the companion rules for spaceships and spaceship combat. ZEBULON'S GUIDE was a re-working of the rules using an action-table, with added background material. The current fan-resurrected edition is available on <a href="http://www.starfrontiersman.com" rel="nofollow">http://www.starfrontiersman.com</a> when it was kicked off by Bill Logan, but the main page is not working for some reason. The download-directory page is, though: <a href="http://www.starfrontiersman.com/PDF" rel="nofollow">http://www.starfrontiersman.com/PDF</a> Download the file that simply says Star Frontiers.pdf; that's the main rulebook. Then there's also KNIGHT HAWKS, ZEBULON'S GUIDE, GAMMA DAWN (a fusion of the Gamma World setting on Star Frontiers rules!), adventure modules, character sheets, and the original maps. Oh, and hardcopy books and adventure modules are available (at print-cost) if you search author "Bill Logan" at <a href="http://www.lulu.com" rel="nofollow">http://www.lulu.com</a> . His fan-magazine Star Frontiersman is also available.