Earth Empires sent me a link to one. Thanks again!
There's plenty of demos out there for the third-party stuff, but I couldn't find a registered copy.
@Kelandon and Alorael: I didn't want to bother Jeff or anyone else at Spiderweb with something so trivial, so thought I'd try the forums. Galactic Core is TERRIBLE compared to Jeff's awesome games, but it was something I played with my older brother growing up and so had enough nostalgic appeal to try hunt down.