Justin D. Jacobson
First Post
I couldn't tell from your initial post if you're specifically looking for mecha-based material or not, but you should have a look at Dawning Star. It's the only full-scale science-fiction campaign setting based on d20 Modern and powered by d20 Future. It's been nominated for an ENnie for Best d20 Game, and it's on sale during the voting period through Indie Press Revolution for a ridiculously low $19.95 for a 208-page hardcover book.