i'm wondering what the knowledgeable peeps here might recommend re: software for designing a fairly simple planetary system: sun, 4 planets, several moons.

ideally i'd like something that could give info on tides and/or weather for the planets based on the moons they have, likely temps based on distance from the sun, etc.

does such a thing exist?

if not then how about something that can tell you about the tides and weather on a single planet based on it's moons?

basically my situation is i have a planet, want it to have two moons, but have no clue how to find out what the tidal effects will be, etc.

any guidance much appreciated.