Citycraft

CityCraft is a great modern modpack that significantly enhances the gaming experience by meaningfully expanding the basic gameplay features.
It is currently WIP. 

Some of the base mods it includes are: Simple Planes, Ultimate Car, The Lost Cities and the EyeMod. 
Later it should be possible to build a modern city, where you can live in multiplayer with other players. The concept is the same as my modpack "Deathdusk" only more modern.