Number of Asteroids: You have to specific the number of asteroids for your asteroid belt Asteroid belt name: You have to give a name to the asteroid belt and all the asteroids of the belt will have the same name Parent body: You have to specific a name of a planet, star or even a moon to make asteroids orbit it Inner radius: You have to specific the inner radius size Outer radius: You have to specific the outer radius size Maximum asteroid radius: You have to specific the maximum radius of the asteroids Maximum eccentricity: You have to specific the maximum eccentricity of the asteroids Maximum inclination: You have to specific the maximum inclination of the asteroids Reference plane: You have to specific the reference plane example: "Equator", "Ecliptic" and others
But if you were talking to JackDole then, sorry for disturbing you.
For example, you can choose between asteroids, comets and dwarf moons. (If you want to create dwarf moons for a gas giant.) But this version has no GUI and naturally Python must be installed on the computer.
Of course, I myself use the Python version, because I can quickly change the program. If I need it. For example, to create such colored asteroids, for the Krypton system.