Atomic SMP was developed as part of a private server. This makes it perfect for anyone who wants to play with there friends. Being a kitchen sink pack, Atomic SMP has a mod for everyone. If you like to farm automate explore or play with magic there is something for you. Key mods include:
Blue Skies
Better end
Twilight forest
Create
Mekanism
Astral Sorcery
Mana and artifice
And so much more
Pack requires 5+ gigs of ram to run.
Not compatible with Optifine.