I understand that your guidelines say that only mods on curse can be added to the mods list, but this Galacticraft thing is a serious problem for those who want to play the mod with friends on Aternos. You see, people have been asking micdoodle8 to add Galacticraft to curse for years, there are multiple forums made about it on their page. I have found one in specific that was asking about it for Aternos itself, and it seems that they will not be adding it to curse for it to be playable with Aternos, and instead want us to ask you to put Galacticraft in the mod list. Here is the forum post:
https://github.com/micdoodle8/Galacticraft/issues/3544
Point is, there are a lot of people that want GalactcraftCore, micdoodlecore, and GalacticraftPlanets to be added to the mod library, and from my perspective, the only thing that is stopping it from being added is the curse exclusivity thing. So if possible, everyone would really appreciate if you made an exception. For the community.
Here's the info on the mod:
Name: Galacticraft
Link: https://micdoodle8.com/mods/galacticraft/downloads
Description: Galacticraft allows you to explore the solar system in your own spaceship.
I hope I didn't miss out on any info. Thank you for your time.