gamerprinter
Mapper/Publisher
Not last month, but last year in December, I released The Planet Builder, as 3PP Starfinder supplement, but while its designed for use in Starfinder, it isn't even OGL. With the help of an astrophysicist, this supplement is a series of tables used to generate scientifically viable, entire star systems, and a planet point system allowing you to settle and grow a star system as a setting over time. I think it's usable even for fantasy settings, if you want a good idea of the star system your fantasy world resides. Of course it's probably more suited to a sci-fi, or science fantasy game. The rules are generic enough to be used for Traveller, Stars Without Number, White Star or any other game you feel such rules are suited. Not quite systemless - but in all practical sake, it is.
For a fantasy setting, knowing what planets or other astral bodies are adjacent to your setting world might have some impact. For example if a large Jovian gas giant is adjacent, if it were too close, chances are nearby planets get ripped apart by the gravitational forces and made into asteroid belts. If the Jovian planet is far enough away, though, it could cause major tidal shifts and/or earthquakes to happen when the gas giant passes by, which could have regular mini-apocalypses on a regular basis that would affect the societies of such worlds.
For a fantasy setting, knowing what planets or other astral bodies are adjacent to your setting world might have some impact. For example if a large Jovian gas giant is adjacent, if it were too close, chances are nearby planets get ripped apart by the gravitational forces and made into asteroid belts. If the Jovian planet is far enough away, though, it could cause major tidal shifts and/or earthquakes to happen when the gas giant passes by, which could have regular mini-apocalypses on a regular basis that would affect the societies of such worlds.
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