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The Modpacks on the Choosing list are mostly ftb,tekkit launcher packs. I do not like many of those packs. Reason is because they are outdated and very stale. So I was wondering for a way to add mods or could you add ATL launcher modpacks? ATl modpacks are very new and updated. I find much enjoyment with friends on those modpacks and would wish so with your server hosting. Since it is very good. This is Pyroblaster,Bye.
Thanks for your responses 
Single mods aren't supported yet. If you want to suggest mod packs, you can do this in this board.
Yeah, ATLauncher modpacks are really nice, they have some really popular modpacks like The MadPack and Sky Factory. It would be a good idea to add some of them. They have 205 different modpacks and 40 public ones, so there's lots of variety.
