Ratpack Gamma is the fresh installment of the Ratpack series with a primary focus on Create: Aeronautics and Aquamirae.
It's relatively generic in terms of modpacks but I think it has a couple neat features that still make it worth playing.
It still has its usual flare of other mods and things to do.
Including things like Occultism, Apotheosis, and Deeper and Darker.
It's designed for the usual server but I think it holds up fairly well as a singleplayer exploration pack.