Aero Technik

Aero Technik was originally designed to be a pack that highlighted Create Aeronautics...then got a little carried away.

I crammed in as many Create add-ons as possible...
...then I realized how many compatability addons there were.

That lead to Mekanism, Ars Novou, AE2, Immersive Engineering and Mine Colonies getting into the pack, along with all the addons and compatabilities for THOSE.

Of course you have to have stuff to go out and see and do once you've got your Airship, so I tossed in a ton of structure mods with settings to make sure they don't all spawn right on top of each other.  Plenty of loot with Artifiacts, Relics, Reliquary and all the compats between them.

Several mods for making yourself stronger like Tyz's skills, Improvable Skillbook 3 and Everlasting Abilities.

Tons of "make it pretty" mods, farming, quality of life and compatability between things for as much of an intigrated and seamless experience as possible.

The pack IS huge, and does require a bit of RAM to play, with 8 gigs dedicated clientside as the recommended.  Connecting for multiplayer via LAN or Servers may require additional arguments added to the launcher.  On testing, my team had to use:

-Dfml.readTimeout=120
and 
-Dfml.loginTimeout=120