Oh yeah, David Weber and Steve White's Starfire series. They are novalizations from the Starfire computer game, which they both wrote for.
Leigh Brackett's stuff is much harder to find. Her career, though illustrious, was cut tragically short. As a result, not many people know her as a writer (though they've probably seen a movie she worked on). I know the Skaith books were published both individually and as an omnibus edition.
What are the quailties of a sci-fi novel that makes it a good gamer sci-fi novel?
I'm seriously interested in folks opinions. I've read many of the recommended books above, and for the life of me I can't see what makes them good "gamer" sci-fi novels . . .

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.