The Planet Builder which lets you create scientifically viable, full star systems, stars, planets, moons, trojans, belts, artificial megastructures from sky elevators to Dyson Spheres, rules for interstellar trade, and rules to allow star systems to grow organically over time. And a full stat block for all.

While the rules were designed for use as a Starfinder Compatible product, in reality, they are generic enough to be useful in all sci-fi games that lack rules for building star systems, including: Stars Without Number, White Star, Traveller RPG, Alien RPG, Star Wars, Star Trek.

GP

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