Tenkar's Tavern, the latest entry on the rumors table is that White Star* and White Star Companion*, the Swords & Wizardry-derived Space Opera RPG from James Spahn and Barrel Rider Games, are now priced on DriveThruRPG as Pay-What-You-Want. If you haven't already, I can highly recommend checking them out, as I think that White Star is my favorite entry in the admittedly well-trodden "Space Opera OSR" sub-genre. Certainly it's the one that has taken off (heh) the hardest, with a variety of other supplements available from both Barrel Rider Games* and others*, not to mention all the fan-made content in the OSR Blog community (a self-referential example). Much of this is designed with an eye towards tailoring your campaign to a specific sub-genre, or even recreating a specific franchise.
Star Knights" and their evil counterparts "Void Knights"? Check. "Qinlons" and "Assimilants", or alternatively Assimilants and "Cannicks"? Check. Something more classic, like "Thronks" or "Wellsians"? Check. All of these together? Go for it! And toss in anything else you can think of - heck, there are even two different versions of Ewoks, "Fluffs" for random encounters and "Yabnabs" for a PC option (capped at Level 4).
If you have even the slightest interest in the genre, there's really no reason not to check these out. It's even got me pondering some new ideas for a mashup setting based on not filing off those serial numbers . . .
*Remember, folks, that any DTRPG links on this blog are affiliate links that pay me a small fee when you use them. Relax, it doesn't cost you a thing.