There is a list of fonts on the FAQ page for the atlas, but it is quite a bit outdated by now. I don't know of any other lists.

As for license questions, those are best sent straight to ProFantasy

Thanks @Wyvern, the maps are now available in the atlas.

Thanks @Quenten, map is now in the atlas:

This is due to the setup in that traveller catalog you are using. For the standard traveller map, a gas giant is treated as a modifier to an existing symbol, to be displayed in the corner of a hex, not in the center where a regular planet goes.

This means that the symbol is quite offset from it's origin, which should be noticeable already at 1x scale, but as you scale up, distances are also scaled obviously, meaning that distance is now 16x larger. (This special placement for traveler is also why it is so small)

The gas giant in the regular planets catalog is more normal, but that is a height symbol, which isn't what you want here.

My recommendation is to create your own symbol catalog. Just make a copy of the traveller one, and then go in and scale all the symbols so they are properly scaled related to each other, and not for the abstract traveller use, and change the origin of the gas giants to be in the middle of the planet.

Yes, as long as you don't touch the actual art files (png files) on disk, it will work just fine for the atlas. It is only a problem for the atlas if you bring your own art files, or modify the official ones (including moving/copying/renaming them).

But anything that is done in-map, like importing existing fills from valid products, or changing the settings for them in the fill dialog is fine. (With one caveat, if you import official fills using the import bitmap fill style tool, DO NOT check the "Create Other Resolutions" checkbox, as if the files didn't have multiple resolutions already (Like all the solid xx fills), it would basically be creating new files for you based on the original ones)