TooManySpells

A somewhat smaller pack thrown together, primarily focused on magic. The goal of the pack is to provide multiple players the ability to specialize in a form of magic or science (or both!), and bring that to the table when it comes to co-op. For example, one person can specialize in Astral Sorcery, then catch everyone up with the relevant buffs, while another can make everyone basic gear using Tinker's Construct until they can make specialize gear themselves.

Contains classic hits such as:
Ars Nouveau (Ars Magica, but modern)
Astral Sorcery (Star-based magic)

Blood Magic (donating blood, but for magic instead of cookies)

Ice & Fire: Dragons (rawr)

Psi (and related expansion mods) (ever seen 'The Irregular at Magic High School'? Yeah. Programming + Magic)

Also includes the bare minimum engineering mods, for those who are mechanically inclined:

Applied Energistics

Create
Extreme Reactors

Mekanism

Tinker's Construct (and related compat. mods)

And of course you can't forget aesthetic mods, such as:

Mr. Crayfish's Furniture Mod (because chairs and window blinds)

Chimes (adds some nice wind chimes, 10/10, might need to spawn them in due to a lack of recipes for some atm)